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Background: One of the challenges for professional football players is injuries. Due to their influence on their teams, injuries greatly impact the sports business. This research aims to assess predictive models of injury risk in male professional football players., Methods: A systematic literature review was performed, following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. The search was conducted in the PubMed, Web of Science and Scopus databases. Two independent reviewers screened articles, assessed eligibility and extracted data. Methodological quality was determined by the Newcastle-Ottawa Scale., Results: 26 studies met the inclusion criteria., Discussion: Various statistical techniques were used in research on injury prediction in professional football, with logistic regression being the most used. The assessment predictors, especially the area under the receiver operating characteristic Curve, showed significant variation, which indicates the prediction models' efficacy. The focus was frequently on lower limb injuries, where several risk predictors, including muscular strength, flexibility and global positioning system-derived data, were found to substantially impact the occurrence of injuries. Prominent predictors included age, position, physiological parameters, injury history and genetic polymorphisms., Conclusions: This comprehensive analysis highlights the complexity of injury prediction and reinforces the necessity for football injury research to adopt a multivariate approach with accuracy and comprehensiveness., Prospero Registration Number: CRD42023465524., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ Group.)

Background: Information on acute traumatic cycling injuries (ATCIs) in the 12 months prior to entry in a cycling race and the predisposing factors have not been well-researched., Objective: Determine factors associated with a history of ATCIs sustained in the previous 12 months by race entrants of a 109 km cycling race., Methods: Descriptive, cross-sectional study on 60 941 Cape Town Cycle Tour race entrants from 2016 to 2020. Data on a history of ATCIs sustained in the previous 12 months were obtained through an online pre-race medical screening questionnaire (mandatory in 2016, and voluntary in 2017-2020). Factors investigated were demographics, cycling/training history and history of chronic disease, collapse, cramping, allergies and regular chronic prescription medication usage. We calculated the prevalence ratio (PR) for reporting a history of an ATCI in the previous 12 months for each category (multiple regression model)., Results: Factors associated with an increased PR for a history of ATCIs gathered from race entrants (34% of the total entrants) were: increased years of participation in distance cycling events >2 hours (PR=1.05 per 5 years of distance cycling, p<0.0001), increased weekly average training/racing distance of a cyclist in the past 12 months (PR=1.11 per 50 km increase in weekly cycling). Other factors were: increased number of chronic diseases reported (PR=1.53, per two additional chronic diseases reported, p<0.0001), history of collapse (PR=1.75, p=0.0005), history of cramping (PR=1.65, p<0.0001) and history of allergies (PR=1.49, p<0.0001)., Conclusions: Subgroups of recreational cyclists at higher risk for ATCIs were identified. This information could assist in developing and implementing future strategies to mitigate ATCIs., Competing Interests: Competing interests: DG is the medical director for the event., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: Given the high incidence and heavy burden of ankle sprains in recruits, large-scale, multifactorial investigations into potential risk factors are warranted. This study aimed to identify the incidence of ankle sprains and associated risk factors among new military recruits during their infantry training., Methods: The study included 365 infantry recruits (aged 18-21 years), who were inducted into service in March 2022. These recruits were monitored for ankle sprains throughout their basicy and advanced infantry training by a physiotherapist. Preinduction smoking habits, physical fitness preparation and recurrent ankle sprains were recorded. Anthropometric measures, lower-extremity functional movement, Achilles tendon structure, perceived ankle instability, and mechanical ankle instability were assessed at the onset of both training periods., Results: Ankle sprains were diagnosed in 109 trainees (29.9%) during both the basic and the advanced training periods. Preinduction recurrent ankle sprains were reported by 28.2% of the participants. The relative risk of a recruit with preinduction ankle sprains suffering a subsequent sprain during training was 1.66 (p=0.001). Logistic regression analysis indicated that reduced proprioception ability (OR=0.002), higher body mass index (OR=1.08), preinduction recurrent sprains (OR=1.95) and lack of physical fitness preparation (OR=3.12) were related to ankle sprains throughout the complete basic-and-advanced training period. Preinduction recurrent ankle sprains (OR=3.37) and reduced Achilles tendon quality (OR=1.30) were associated with ankle sprains during the advanced training period., Conclusions: Lower-extremity functional movement, body mass index, preinduction recurrent sprains, physical preparation and reduced Achilles tendon quality were associated with the risk of ankle sprains during training. These findings could contribute to developing prevention and intervention programmes for reducing ankle sprains in military trainees., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: Suicide remains a major public health problem, and firearms are used in approximately half of all such incidents. This study sought to predict the occurrence of suicide specifically by firearm, as opposed to any other means of suicide, in order to help inform possible life-saving interventions., Methods: This study involved data from the Minnesota Violent Death Reporting System. Models evaluated whether data beyond basic demographics generated increased prediction accuracy. Models were built using random forests, logistic regression and data imputation. Models were evaluated for prediction accuracy using the area under the curve analysis and for proper calibration., Results: Results showed that models constructed with social determinants and personal history data led to increased prediction accuracy in comparison to models constructed with basic demographic information only. The study identified an optimised 'top 20' variables model with a 73% chance of correctly discerning relative incident risk for a pair of individuals. Age, height/weight, employment industry/occupation, sex and education level were found to be most highly predictive of firearm suicide in the study's 'top 20' model., Conclusions: The study demonstrated that the use of a firearm in a death by suicide, as opposed to any other means of suicide, can be reasonably well predicted when an individual's social determinants and personal history are considered. These predictive models could help inform many prevention strategies, such as safe storage practices, background checks for firearm purchases or red flag laws., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: Skateboarding is an increasingly popular leisure activity for youth, yet injuries due to falls are common. This study aimed to identify the features at skateparks and tricks performed by youth that pose an increased risk of falls in skateboarders., Method: Video recordings were unobtrusively taken at a large skatepark of youth designated as young (11-15 years) or old (16-20 years). Videos were coded to identify the popular skatepark features used and tricks performed, and to assign a fall severity outcome rating for each feature and each type of trick attempted., Results: The results identify features and tricks that pose increased risk of falling for youth at skateparks., Conclusions: Implications for injury prevention are discussed, including a consideration of environmental (skatepark design) and individual (youth behaviour) factors relevant to reducing skateboarding injuries due to falls among youth., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ.)

Objectives: To identify risk factors associated with falls in older people in rural China., Methods: A prospective cohort study was conducted across 27 villages in the rural areas of Ningxia, China. After excluding individuals younger than 60 years, a total of 758 out of the initial 822 participants were ultimately included for the collection of baseline information. Participants were followed up through telephone calls or face-to-face interviews at 3rd, 6th and 12th months following the baseline investigation. The Cox proportional hazards regression model was used to examine risk factors of falls., Results: A total of 758 participants underwent baseline information surveys, and all samples were included in the Cox model analysis. The study found that being woman (RR=1.879, 95% CI: 1.313 to 2.668), smoking (RR=1.972, 95% CI: 1.238 to 3.143), use of painkillers (RR=1.700, 95% CI: 1.226 to 2.356) and higher systolic blood pressure (SBP) (RR=1.081, 95% CI: 1.013 to 1.154) were associated with higher risk of falls among the elderly in rural China. After excluding those who were lost to follow-up or deceased, 738 participants completed the follow-up. There were 341 men (46.2%) and 397 women (53.8%), with an average age of 66.8±5.0 years. The fall rate in study area was 23.8% during the follow-up period., Conclusions: The fall rate among the elderly in rural China was higher than other areas. Our findings revealed that being woman, smoking, medication usage, elevated SBP and people with a higher body mass index were risk factors for developing falls., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ.)

Introduction: Road traffic injuries are a significant public health issue in low-income and middle-income countries. This study was designed to explore the pattern and factors associated with road traffic injury in a high-risk zone of Bangladesh., Method: This mixed-method study included a total of 363 road traffic injury victims for the quantitative component, and 10 traffic-related officials and 10 drivers for the qualitative element. Data were collected using a pretested questionnaire, key informant interviews and a focus group discussion using a focus group discussion guide. Quantitative and qualitative analyses were done using Stata V.17 and NVivo V.12, respectively., Results: Most participants were male, illiterate and young (<30 years) with age averaging 31.50±9.16 years. Of all road traffic injury victims, most had mild (45.18%) injuries, and the least had severe (5.79%) injuries, with head being the most common site (34.44%). The highest proportion of injuries were sustained by motor vehicle drivers (57.58%), followed by cyclists/rickshaw pullers (22.59%) and passengers (19.83%). Most vehicles were new (75.21%), and the rest were old (24.79%). Nearly one-third of the participants did not know about driving rules. The presence of knowledge was associated with less severe injury (p = 0.031) compared with the absence of knowledge. The qualitative component of the study identified several factors related to road traffic injury, including driver factors (lack of sleep, bad driving habits and lack of helmets), driving activity factors (ignoring rules, overtaking, crossing speed limits and using bright headlights), road-related factors (broken roads, unplanned curves and angles, the need for spacious streets and the lack of appraisal of previous crash records) and traffic control factors (stringent traffic rules, effective implementation and training on using speed guns)., Conclusion: The factors related to road traffic injury identified in this study could be used to plan targeted interventions for road safety improvement., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Objective: This study aims to assess the familial aggregation of traffic risky behaviours among pedestrians and describe the sociodemographic profile of pedestrians in northwestern Iran., Methods: A cross-sectional study was conducted among 933 pedestrians in 2023. Participants were selected using stratified random sampling. Traffic risky behaviour was measured using a validated instrument among heads of households and their first relatives. The generalised estimating equations were computed to estimate the adjusted OR and 95% CI for familial aggregation of traffic risky behaviours., Results: Of the total sample, 52.2% and 27.7% of the participants were male and aged 41-50, respectively. The majority of respondents were categorised in middle socioeconomic class (36.9%). The OR for familial aggregation of traffic risky behaviours was 1.42 (95% CI 1.07 to 1.89), indicating that the presence of traffic risky behaviours in at least one family member increased the likelihood of similar behaviour in other members. Fathers showing violation behaviours were associated by 1.98-fold increase in violation behaviours among their offspring. Similarly, the existence of violation behaviour in one sibling increased the odds of violation behaviour among other siblings (OR 1.99, 95% CI 1.18 to 3.73)., Conclusions: This study revealed the familial aggregation of traffic risky behaviours of pedestrians, with father-offspring and sibling aggregations emerging as prominent components of familial aggregation. The findings suggested that family-based prevention programmes may yield greater effectiveness than individual-based approaches. As such, implementing targeted interventions focusing on family might have a substantial impact on reducing pedestrian traffic risky behaviours., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: Helicopter evacuation is crucial for providing medical care to casualties. Previous civilian studies have demonstrated that air transport can enhance survival rates compared with ground transport. However, there has been limited research on specific accelerations during helicopter flights, particularly in military flights. This study aims to analyse and compare the accelerations endured during civilian and military helicopter evacuations., Methods: Accelerations were recorded during evacuation flights from the site of injury to the first medical responders in civilian helicopter EC135 T1, and military Puma SA.330 and Caiman NH90 TTH helicopters. The research investigated global acceleration and compared acceleration distributions along the vertical, lateral and longitudinal axes. A specific comparative study of the take-off phases was also performed., Results: The analysis showed that vertical loads caused the most extreme accelerations for all types of helicopter but these extreme accelerations were rare and lasted for less than 1 s. Military flights show similar acceleration intensities to civilian flights, but accelerations are higher during short periods of the take-off phase., Conclusions: The findings suggest that helicopter evacuations during military operations are as safe as civilian evacuations and highlight the importance of patient positioning in the aircraft. However, further research should investigate the haemodynamic response to accelerations experienced during actual evacuation flights., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ.)

Introduction: There are many migrant workers in China's first-tier cities, but little is known about road safety. This paper systematically analysed road traffic injuries and risk factors among migrant workers in Guangzhou, China., Methods: Road traffic crash data from 2017 to 2021 were obtained from the Guangzhou Public Security Traffic Management Integrated System. We plotted the crash network of road users in road traffic crashes and used logistic regression to analyse the risk factors for migrant workers of motorcycle and four-wheeled vehicle crashes. Moreover, the roles of migrant workers and control individuals as perpetrators in road traffic crashes were also analysed., Results: Between 2017 and 2021, 76% of road traffic injuries were migrant workers in Guangzhou. Migrant workers who were motorcyclist drivers most commonly experienced road traffic injuries. Crashes between motorcyclists and car occupants were the most common. The illegal behaviours of migrant worker motorcyclists were closely related to casualties, with driving without a licence only and driving without a licence and drunk driving accounting for the greatest number. Migrant workers were responsible for many injuries of other road users. Motorcycle drivers have a higher proportion of drunk driving., Discussion: Migrant workers play an important role in road traffic safety. They were both the leading source of road traffic injuries and the main perpetrators of road traffic crashes. Measures such as strict requirements for migrant workers to drive motorcycles with licences, prohibit drunk driving, greater publicity of road safety regulations, and combining compulsory education with punishment for illegal behaviours., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Objective: To examine data on COVID-19 disease associated with a 10% increase in US road deaths from 2020 to 2021 that raises the question of the potential effect of pandemic stress and neurological damage from COVID-19 disease., Methods: Poisson regression was used to estimate the association of recent COVID-19 cases, accumulated cases, maximum temperatures, truck registrations and gasoline prices with road deaths monthly among US states in 2021. Using the regression coefficients, changes in each risk factor from 2020 to 2021 were used to calculate expected deaths in 2021 if each factor had remained the same as in 2020., Results: Corrected for the other risk factors, road deaths were associated with accumulated COVID-19 cases but not concurrent cases. More than 20 700 road deaths were associated with the changes in accumulated COVID-19 cases but were substantially offset by about 19 100 less-than-expected deaths associated with increased gasoline prices., Conclusions: The lingering effects of COVID-19 on neurological function may be a risk factor for behaviour leading to road deaths., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ.)

Football players frequently face the occurrence of non-contact injuries. Although there are likely multiple factors that contribute to increased risk of non-contact injury, it remains a challenge to correlate all these factors. However, it is not clear how much of individual training abilities may interfere in these events. As such, the primary aim of the present study was to determine whether the reduction of functional performance of the thigh in the isokinetic knee tests, anthropometric and morbid history can establish risk factors for lower-limb musculoskeletal injuries throughout the season. The incidence of injuries and odds ratios were calculated for suspected risk factors. Hamstring/Quadriceps conventional ratio outside of the safety range (55–64%) may be involved in the occurrence of non-contact muscle injuries and the risk for any musculoskeletal injuries in the lower extremities is 16 times higher when extensor peak of torque exceeds 10% and 12 times higher when flexor peak of torque difference was greater than 10%. This kind of evaluation can result in intervention programs that may decrease the risk of lower-limb musculoskeletal injuries. Based on these results we can establish a specific and individualized exercise program for each athlete and thus protect them during the season. [ABSTRACT FROM AUTHOR]

Background: The short-term association between increasing temperatures and injury has been described in high-income countries, but less is known for low-income and-middle-income countries, including Vietnam., Methods: We used emergency injury visits (EIV) data for 2017-2019 from 733 hospitals and clinics in Hanoi, Vietnam to examine the effects of daily temperature on EIV. Time-series analysis with quasi-Poisson models was used to estimate a linear relative risk increase (RRI) for overall populations and ones stratified by age and sex. Exposure-response curves estimated non-linear associations as an RR between daily temperature and injury. Models were adjusted for the day of week, holidays, daily relative humidity, daily particulate matter, and long-term and seasonal trends., Results and Conclusions: A total of 39 313 EIV were recorded averaging 36 injuries daily. Injuries more likely occurred in males and those aged 15-44, and aged 44-60. For linear effects, a 5°C increase in same day mean temperature was associated with an overall increased EIV (RRI 4.8; 95% CI 2.3 to 7.3) with males (RRI 5.9; 95% CI 3.0 to 8.9) experiencing a greater effect than females (RRI 3.0; 95% CI -0.5 to 6.5). Non-linear effects showed an increase in EIV at higher temperatures compared with the threshold temperature of 15°C, with the greatest effect at 33°C (RR 1.3; 95% CI 1.2 to 1.6). Further research to investigate temperature-injury among different populations and by the cause of injury is warranted., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Objective: To identify antenatal and early childhood exposures of unintentional injury among infants in New Zealand (NZ)., Method: The theoretical life-course framework of child injury prevention domains was utilised to analyse data from a prospective longitudinal NZ birth cohort (Growing Up in NZ). Risk and protective factors for injury were identified using Robust Poisson regression models., Result: Among children included for the analysis(n=6304), 52% were male, 55% were born to European mothers, and 37% lived in a household with high levels of deprivation. Mothers reported that 6% of infants (n=406) had sustained at least one injury by 9 months. Multivariate analysis showed injury risk among single mothers with antenatal depression were more than twice that (IRR=2.20) of children of mothers with partners and without depression., Conclusion: Understanding antenatal risk and protective factors for infant injury will assist in implementing injury prevention programmes or modifying the existing policies that affect these vulnerable age groups., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2023. No commercial re-use. See rights and permissions. Published by BMJ.)

The study examines changes over time in crash risk differences between young Australian drivers born in Asia and those born in Australia.Data from the 2003 baseline survey of the DRIVE cohort of 20 806 young drivers aged 17-24 years were linked to police, hospital and death data up until 2016. The association between country of birth and crash was investigated using flexible parametric survival models adjusted for confounders.Six months after baseline, the crash risk in Asian-born drivers was less than half that of their Australian-born counterparts (mean HR, MHR 0.41; 95% CI 0.29 to 0.57), only to increase steadily over time to resemble that of Australian-born drivers 13 years later (MHR 0.94; 95% CI 0.66 to 1.36).This is likely to be associated with acculturation and the adoption by young Asian-born Australian drivers of driving behaviour patterns akin to those born locally. This needs to be considered in future road safety campaigns., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2023. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: The study of risk factors for antisocial and delinquent behavior has flourished in the past 20 years, as great strides have been made in understanding the developmental pathways that give rise to the onset, course, and desistance of the behavior. However, as a body of literature, risk factor research (RFR) is characterized by heterogeneity in definitions, conceptualization, and measurement of key constructs that can make it difficult to discern robust from spurious findings. This may pose challenges to child-serving agencies invested in developing crime reduction policies and programs but lack the resources to carefully comb through and make sense of the literature. Objective: This article reviews the terminological, conceptual, and methodological issues in the RFR literature with an aim towards clarifying some of the inconsistencies that limit interpretation and application of findings. Risk factors related to antisocial and delinquent behavior are used to illustrate the concepts discussed. Method: We reviewed the RFR literature pertaining to antisocial and delinquent behavior in children and youth to identify key concepts and discrepancies in this area. Conclusions: The literature would be well served if researchers were consistent in their use of terminology to describe the effects of risk factors on antisocial and delinquent behavior. There is also a need to study the processes and causal mechanisms that link past events to future outcomes. [ABSTRACT FROM AUTHOR]

Objectives: To explore the impact of mandatory lifejacket wear legislation on unintentional rock fishing-related drowning fatalities at declared high-risk rock platforms in New South Wales (NSW; Australia)., Methods: Rock fishing-related drownings for the five years pre-legislation enactment (23 November 2011 to 22 November 2016) and five years post-legislation enactment (23 November 2016 to 22 November 2021) were compared. Google Earth was used to assess if drowning deaths occurred at declared areas under legislation. Binary logistic regression was used to analyse change in the number of deaths in declared areas pre-legislation/post-legislation., Results: Over the 10 years, 80 rock fishing drowning deaths occurred in New South Wales; 23 in declared areas pre-legislation and 13 post-legislation (-43.5%). The odds of a rock fishing drowning death occurring in a declared area pre-legislation was 2.3 times higher (95% CI 0.942 to 5.752; p=0.067)., Conclusion: Reductions in rock fishing deaths at declared areas were observed since the legislation's introduction, but were not significant. Greater enforcement and extension to other high-risk platforms may reduce deaths further., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2022. No commercial re-use. See rights and permissions. Published by BMJ.)

Objective: To predict the coast-wide risk of drowning along the surf beaches of Gironde, southwestern France., Methods: Data on rescues and drownings were collected from the Medical Emergency Center of Gironde (SAMU 33). Seasonality, holidays, weekends, weather and metocean conditions were considered potentially predictive. Logistic regression models were fitted with data from 2011 to 2013 and used to predict 2015-2017 events employing weather and ocean forecasts., Results: Air temperature, wave parameters, seasonality and holidays were associated with drownings. Prospective validation was performed on 617 days, covering 232 events (rescues and drownings) reported on 104 different days. The area under the curve (AUC) of the daily risk prediction model (combined with 3-day forecasts) was 0.82 (95% CI 0.79 to 0.86). The AUC of the 3-hour step model was 0.85 (95% CI 0.81 to 0.88)., Conclusions: Drowning events along the Gironde surf coast can be anticipated up to 3 days in advance. Preventative messages and rescue preparations could be increased as the forecast risk increased, especially during the off-peak season, when the number of available rescuers is low., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Objective: This study was designed to reveal the relationship between the use and type of eye protection and the occurrence of work-related corneal and conjunctival foreign body injuries., Methods: This is a retrospective cohort study of patients with work-related corneal and/or conjunctival foreign body injuries between 1 August 2017 and 31 July 2018. They were all diagnosed and treated at Jia Ding Hospital affiliated to the Shanghai University of Medicine and Health Sciences in Shanghai, China. All patients received a comprehensive eye examination and a face-to-face interview using a structured questionnaire by ophthalmologists., Results: A total of 426 consecutive patients were included in the study. The majority of work-related eye injuries occurred in men (94.17%). Summer was the season that had the highest incidence of eye injuries, especially in July and August (38.03%). There were 290 patients (68.08%) that were injured more than once. The ratio of eye protection use to non-protection was 1:7 at the first time of eye injury. The ratio improved to 1:3 on subsequent injury. A majority of employers (79.11%) provided eye protection to employees. However, 19.95% of the workers were injured despite wearing a pair of protective spectacles. The causes of work-related eye injury were as follows: no eye protections provided (20.89%); unawareness of work safety (30.99%); defect of spectacles (47.18%)., Conclusions: Protection use at work effectively prevents work-related eye injuries. Both employers and employees require improved awareness of workplace hazards and personal protection. Eye protection should be selected appropriately according to the work environment., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: Coal mine gas explosion injury has caused mass casualties, which have resulted in widespread concern., Methods: In order to prevent gas explosion injury in coal mine, 24Model is proposed to analyse the risk in this paper. 24Model is a human-oriented and organisation-oriented risk analysis method. Based on the 24Model, we propose a general procedure for analysing the causes of injury within the organisation., Results: A coal mine gas explosion case was analysed using the 24Model and the proposed analysis method, and the evolution of injury and the interaction of various causes was showed, and 6 unsafe conditions, 25 unsafe acts, 13 safety knowledge, 13 safety management systems and 13 safety cultures were obtained., Conclusion: Case analysis results show that by using the 24Model and analysis method the proposed effect can help employees to clearly see the evolution and identify the causes of the injury, to better understand the logical relationship with the causes of the injury, improve the effectiveness of training and effectively prevent similar injury. The case study provides a practical procedure for injury investigation and analysis, and thus, preventive measures can be made according to the various causations at different levels., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: Driving under the influence of drugs (DUID) is a burgeoning public health concern in the USA. Because little is known about individuals who engage in DUID, the purpose of this study was to analyse potential sociodemographic characteristics and behavioural risk factors associated with the behaviour., Methods: Self-reported data from drivers ≥18 years of age who ever used drugs and participated in the 2018 National Survey on Drug Use and Health were used. Characteristics of those who reported to engage and not engage in DUID were compared via frequencies, percentages and logistic regression analyses, which accounted for the multistage survey design., Results: Among eligible respondents, 10.4% (weighted n=117 275 154) reported DUID. DUID was higher among those aged 18-25 year (34%), males (65%), unmarried individuals (61%), lesbian/gay/bisexuals (13%), those whom abused or were drug dependent (45%), engaged in numerous risky lifestyle behaviours (12%) and those taking medication for a mental health issue (22%). Nearly 20% and 6% of respondents engaged in DUID abused or were dependent on marijuana or methamphetamine, respectively. The adjusted odds of DUID were greatest among those 18-25 years of age (OR 3.7; 95% CI 2.8 to 5.0), those never/not married (OR 1.8; 95% CI 1.5 to 2.2), those who abused or were drug dependent (OR 4.0; 95% CI 3.5 to 4.7), exhibited riskier lifestyle behaviours (OR 8.0; 95% CI 5.9 to 11.0), were employed (OR 1.3; 95% CI 1.1 to 1.6) or lesbian/gay/bisexuals (OR 1.4; 95% CI 1.1 to 1.7)., Conclusions: DUID was common among some population sub-groups who may benefit from intervention., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.)

Objective: Our objective was to describe the development of the New Jersey Safety and Health Outcomes (NJ-SHO) data warehouse-a unique and comprehensive data source that integrates state-wide administrative databases in NJ to enable the field of injury prevention to address critical, high-priority research questions., Methods: We undertook an iterative process to link data from six state-wide administrative databases from NJ for the period of 2004 through 2018: (1) driver licensing histories, (2) traffic-related citations and suspensions, (3) police-reported crashes, (4) birth certificates, (5) death certificates and (6) hospital discharges (emergency department, inpatient and outpatient). We also linked to electronic health records of all NJ patients of the Children's Hospital of Philadelphia network, census tract-level indicators (using geocoded residential addresses) and state-wide Medicaid/Medicare data. We used several metrics to evaluate the quality of the linkage process., Results: After the linkage process was complete, the NJ-SHO data warehouse included linked records for 22.3 million distinct individuals. Our evaluation of this linkage suggests that the linkage was of high quality: (1) the median match probability-or likelihood of a match being true-among all accepted pairs was 0.9999 (IQR: 0.9999-1.0000); and (2) the false match rate-or proportion of accepted pairs that were false matches-was 0.0063., Conclusions: The resulting NJ-SHO warehouse is one of the most comprehensive and rich longitudinal sources of injury data to date. The warehouse has already been used to support numerous studies and is primed to support a host of rigorous studies in the field of injury prevention., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: Fatal drowning is one of the leading causes of unintentional injury mortality worldwide and a persistent public health concern in Greece. While several pathologic and sociodemographic contributing factors have been previously identified, these have not been extensively investigated in conjunction with the effects of psychoactive substances., Methods: A retrospective case-control study of drowning deaths was conducted in the Greek regions of Northern Greece and Thessaly during a 10-year period. A regression model was constructed examining differences in detected substances, autopsy findings and sociodemographic characteristics between 240 victims of unintentional fatal submersion and 480 victims of other causes of sudden or violent death., Results: The majority of victims were males (69.4%) and foreign nationality was associated with increased odds of drowning. Cardiomegaly and coronary bypass grafts were significantly more likely to have been recorded among drowning victims, while the frequency of other circulatory system disorders was also elevated. Several of these findings were potential arrhythmogenic substrates which could adversely interact with the diving reflex. Selective serotonin reuptake inhibitors (SSRIs) were the most commonly detected pharmacological group (9.0%), and along with tramadol, there was an increased likelihood of exposure to them. These drugs have been previously associated with QT prolongation and other adverse effects which may contribute to fatal outcomes in a seawater environment. In contrast, there was a decreased risk of exposure to dependence-inducing drugs and paracetamol., Conclusions: Male sex, older age, foreign nationality and cardiovascular disease predisposed individuals to an elevated risk of fatal submersion. SSRI antidepressants and tramadol may contribute to this outcome., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: There are limited data on acute injury-related medical encounters (injuries) in endurance cycling events., Objective: To determine the risk factors for injuries during a mass community-based endurance cycling event., Design: Retrospective, cross-sectional study., Setting: Cape Town Cycle Tour (109 km), South Africa., Participants: 102 251 race starters., Methods: All injuries for 3 years were recorded by race medical doctors and nurses. Injuries were grouped into main anatomical area of injury, and a Poisson regression model was used to determine the risk factors associated with injuries., Results: The four injury risk factors associated with all injuries during an endurance cycling event were sex (women vs men, p<0.0001), older age (p=0.0005), faster cycling speed (p<0.0001) and higher average individualised Wind Speed (aiWindSpeed, p<0.0001). The only risk factor for serious/life-threatening injuries was women (p=0.0413). For specific main anatomical areas: head/neck (women), upper limb (women, older age, faster cyclists), trunk (women, higher aiWindSpeed), and lower limb (higher aiWindSpeed)., Conclusion: Women, older age, faster cycling speed and higher aiWindSpeed were all risk factors for acute injuries during a mass community-based endurance cycling event. These risk factors should help inform race organisers and medical teams on race day to ensure the best medical care is given, and effective acute injury prevention programmes are disseminated., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.)

Objectives: To assess crash risk and driving habits associated with chronic medical conditions among drivers entering old age., Design: Prospective cohort study., Setting: French cohort GAZEL., Participants: 12 460 drivers in the analysis of road traffic crash, among whom 11 670 completed the follow-up period (2007-2014). We assessed driving cessation among 11 633 participants over the same period, and mileage and driving avoidance among the 4973 participants who returned a road safety questionnaire in 2015., Main Outcome Measures: Yearly occurrence of at least one road crash as a driver; time to driving cessation; mileage; driving avoidance: at night, with bad weather, in heavy traffic, with glare conditions, over long distances., Results: Several potentially risky conditions ( angina, myocardial infarction, coronary disease ; stroke; nephritic colic, urinary stones ; glaucoma) were associated with lower mileage and/or driving avoidance and did not increase crash risk. Neither driving avoidance nor lower mileage was found for other conditions associated with an increased crash risk: hearing difficulties (adjusted OR 1.19, 95% CI 1.06 to 1.34); joint disorders (1.17, 95% CI 1.06 to 1.30). Depression, anxiety and stress was associated with an increased crash risk (1.23, 95% CI 1.01 to 1.49) despite increased driving avoidance. Parkinson's disease was associated with driving cessation (adjusted HR 32.61, 95% CI 14.21 to 65.17)., Conclusions: Depending on their condition, and probably on the associated risk perception, drivers entering old age report diverse driving habits. For example, hearing difficulties is a frequent condition, rarely considered a threat to road safety, and nonetheless associated with an increased crash risk., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.)

Background: The use of off-road vehicles such as all-terrain vehicles (ATVs) and recreational off-highway vehicles has increased in recent years. A higher percentage of patients hospitalised following ATV crashes suffered severe injuries, compared with those hospitalised following other MVCs., Objective: To identify incidence of ATV-related injury and characterise groups with higher prevalence., Methods: A retrospective study of the Israel National Trauma Registry data between years 2008 and 2016. ATV crash victims were compared with other types of MVC casualties according to demographics, injuries and hospital resource utilisation. Identifying groups with greater prevalence for severe injuries caused by ATV crashes was conducted using logistic regressions., Results: An increase of 49% in the number of casualties hospitalised following an ATV crash was observed between 2013 and 2016. Non-Jews, males and users 15-29 years old were hospitalised at a higher rate compared with their proportion in the population. ATV crash casualties were more severely injured compared with other MVC casualties (22% vs 14%), had longer hospital length of stay (8+ days) (25% vs 18%), more admissions to intensive care units (16% vs 10%) and underwent more surgery (39% vs 26%, respectively). Males, non-Jews and casualties who did not wear a helmet were about two times more likely to suffer from severe head injury (95% CI 1.20 to 3.60, 1.41 to 2.75 and 1.27 to 4.73, respectively)., Conclusions: An increase in ATV-related casualties was observed. A customised safety intervention programme is needed that targets demographic groups identified with higher injury incidence. Awareness of legislated and common sense ATV safety practices, specifically helmet use, should be raised., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.)

Objectives: This study aimed to investigate the association between sociodemographic factors and residential fire fatalities in Sweden. A majority of fatal fires occur in housing. An understanding of risk factors and risk groups is a must for well-founded decisions regarding targeted prevention efforts. There is a lack of consideration of the interrelation between sociodemographic factors and fire fatalities and there is a lack of high quality large-scale studies., Methods: In this matched case-control study, residential fire fatalities (cases, n=850) (age above 19 years old) were identified in the national register on fatal fires. Four controls per case were randomly matched by gender and age. ORs were calculated to assess the association between different sociodemographic factors with residential fire fatalities using conditional logistic regression., Results: Having low income, receiving social allowance and receiving health-related early retirement pension were associated with an increased risk of dying in residential fires. The results also show clearly that adults dying in residential fires to a significantly lower extent were living together with a partner, were in work, were highly educated and lived in urban areas. However, contrary to previous research, living in rented apartments appeared not to influence the risk of death., Conclusions: In this study, we show that fatalities due to residential fires in Sweden are associated with some but not all of previously published sociodemographic risk factors. The results provide valuable information that can improve the guiding and targeting of fire mortality prevention strategies in Sweden., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.)

Introduction: Globally, rivers are a common drowning location. In Australia, rivers are the leading location for fatal drowning. Limited information exists on exposure and impact on river drowning risk., Methods: Australian unintentional fatal river drowning data (sourced from coronial records) and nationally representative survey data on river visitation were used to estimate river drowning risk based on exposure for adults (18 years and older). Differences in river drowning rates per 100 000 (population and exposed population) were examined by sex, age group, activity prior to drowning, alcohol presence and watercraft usage., Results: Between 1 January 2014 and 31 December 2016, 151 people drowned in Australian rivers; 86% male and 40% aged 18-34 years. Of survey respondents, 73% had visited a river within the last 12 months. After adjusting for exposure: males were 7.6 times more likely to drown at rivers; female drowning rate increased by 50% (0.06-0.09 per 100 000); males aged 75+ years and females aged 55-74 years were at highest risk of river drowning; and swimming and recreating pose a high risk to both males and females. After adjusting for exposure, males were more likely to drown with alcohol present (RR=8.5; 95% CI 2.6 to 27.4) and in a watercraft-related incident (RR=25.5; 95% CI 3.5 to 186.9)., Conclusions: Calculating exposure for river drowning is challenging due to diverse usage, time spent and number of visits. While males were more likely to drown, the differences between males and females narrow after adjusting for exposure. This is an important factor to consider when designing and implementing drowning prevention strategies to effectively target those at risk., Competing Interests: Competing interests: None declared., (© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2019. All rights reserved. No commercial use is permitted unless otherwise expressly granted.)

Background: Previous studies have identified risk factors for dog bites in children, but use data from individual trauma centers, with limited generalizability. This study identifies a population risk profile for pediatric dog bites using the National Trauma Data Bank. We hypothesized that the population at risk was younger boys, that such bites occur at home, are moderately severe, and are on the face or neck., Methods: For this retrospective cross-sectional study, a sample of 7912 children 17 years old and younger with International Classification of Diseases (ICD)-9 event code E906.0, for dog bites, were identified. Datasets from 2007 to 2014 were used. Data included patient's gender, age, ICD-9 primary and location E-codes, AIS body region and AIS severity., Results: Most children were 6-12 years old and female, but a similar number fell into the narrower range of 0-2 years old. Injuries in the younger group frequently occurred at home, on the face and head, and with minor severity. Age of the child predicts the location of incident (P<0.001), the severity of injury (P<0.001) and the body region of the injury (P<0.001). Body region of the injury predicted its severity (P<0.001)., Discussion: Younger children are more likely to receive dog bites, and bites incurred are likely of greater severity. Children this young cannot yet be taught how to properly interact with a dog., Conclusions: Dog bites are a significant source of morbidity for children. Based on the population risk factors profile generated, this study recommends targeting live dog education towards the parents of young children., Competing Interests: Competing interests: None declared., (© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2019. All rights reserved. No commercial use is permitted unless otherwise expressly granted.)

Objective: Student-inflicted injury to staff in the educational services sector is a growing concern. Studies on violence have focused on teachers as victims, but less is known about injuries to other employee groups, particularly educational assistants. Inequities may be present, as educational assistants and non-educators may not have the same wage, benefits, training and employment protections available to them as professional educators. We identified risk factors for student-related injury and their characteristics among employees in school districts., Methods: Workers' compensation data were used to identify incidence and severity of student-related injury. Rates were calculated using negative binomial regression; risk factors were identified using multivariate models to calculate rate ratios (RR) and 95% CIs., Results: Over 26% of all injuries were student-related; 8% resulted in lost work time. Special and general education assistants experienced significantly increased risk of injury (RR=6.0, CI 5.05 to 7.15; RR=2.07, CI 1.40 to 3.07) as compared with educators. Risk differed by age, gender and school district type. Text analyses categorised student-related injury. It revealed injury from students acting out occurred most frequently (45.4%), whereas injuries involving play with students resulted in the highest percentage of lost-time injuries (17.7%) compared with all interaction categories., Conclusion: Student-inflicted injury to staff occurs frequently and can be severe. Special education and general assistants bear the largest burden of injury compared with educators. A variety of prevention techniques to reduce injury risk and severity, including policy or environmental modifications, may be appropriate. Equal access to risk reduction methods for all staff should be prioritised., Competing Interests: Competing interests: None declared., (© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2019. All rights reserved. No commercial use is permitted unless otherwise expressly granted.)

Competing Interests: Competing interests: None declared.

Gun violence has increased in Mexico since the mid-2000s, but little is known about patterns of gun ownership. We examine the size and composition of the privately held urban firearm stock in Mexico, motivations for ownership, and attitudes about gun laws. To this end, a household telephone survey of 1361 adults living in nine Mexican cities was conducted in the summer of 2017. We find that few urban Mexican households contain guns. Most of those who report ownership possess one gun, having purchased it recently for self-defense. Few urban Mexican citizens plan to purchase a gun in the future. Respondents are more likely to believe that crime in Mexico would increase if guns were allowed in more places (ie, workplaces and motor vehicles). Evidence suggests urban Mexico has relative low rates of firearm ownership. Few city dwellers plan on obtaining a firearm in the near future., Competing Interests: Competing interests: None declared., (© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2019. All rights reserved. No commercial use is permitted unless otherwise expressly granted.)

Objectives: While Japan has socioeconomic issues, such as income inequality, little is known about the association between socioeconomic factors and the risk of unintentional childhood injuries. The purpose of the study was to evaluate the influence of socioeconomic factors on the risk for unintentional injuries among preschool children in Japan., Design: Cross-sectional study using data from a web-based questionnaire survey., Setting: Japan (January 2015)., Participants: 1000 households with preschool children under 6 years of age., Outcome Measures: Multivariate logistic regression was performed to analyse the influence of socioeconomic factors on the incidence of unintentional injuries., Results: Overall, 976 households were eligible for the analysis, with 201 households reporting unintentional injuries. The incidence rates for unintentional injury were estimated to be constant across all strata constructed using combinations of socioeconomic factors. The multivariate logistic regression analysis showed no significant differences in socioeconomic factors between households that reported unintentional injuries and those that did not., Conclusion: The findings of our study demonstrated that unintentional injuries among preschool children occurred at approximately fixed rates, independent of socioeconomic factors. Accordingly, prevention strategies for unintentional injuries that concern socioeconomic disadvantages should be avoided in Japan., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Purpose: Drowning is a global public health issue and prevention poses an ongoing challenge for all countries. Many nations are experiencing ageing populations, and little is known about the epidemiology, risk factors and prevention of drowning deaths among older people. This paper reports on a systematic review of literature published on drowning among older people., Methods: A systematic literature review was undertaken using English-language, Portuguese-language and Spanish-language papers published between 1980 and 2015. The review explores gaps in the literature with a focus on the epidemiology, risk factors and strategies for the prevention of unintentional fatal drowning among people 50 years and over., Results: Thirty-eight papers were deemed relevant to the study design, including 18 (47%) on epidemiology, 19 (50%) on risk factors and 9 (24%) on strategies for prevention. Risk factors identified included male gender, ethnicity, rurality and increasing age. Prevention strategies commonly proposed were education and wearing life jackets. Gaps identified in the published literature include a lack of consistency around age groupings used for epidemiological studies; a lack of consensus on risk factors; a lack of total population, country-level analysis; and the need for older age-specific prevention strategies that have been implemented and their effectiveness evaluated., Conclusion: This review identified drowning deaths among older people as a global issue. Further work is required to reduce drowning in this cohort. High-quality epidemiological studies identifying risk factors using standardised age groupings to allow for international comparisons are required, as are implementation and evaluation of older age-specific prevention strategies., Competing Interests: Competing interests: None declared., (© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2018. All rights reserved. No commercial use is permitted unless otherwise expressly granted.)

Background: Electric bike (E-bike)-related deaths have been increasing rapidly in China and such injuries may be partly attributable to unsafe riding practice., Objectives: To describe potentially unsafe riding behaviours among electric bikers (E-bikers) and to investigate factors influencing these practices in China., Methods: In September 2012, a cross-sectional observation study including a speed measurement component was conducted in Wuzhong (an urban district) and Zhangjiagang (a rural district) of Suzhou, Jiangsu Province, China. Hand-held radar speed metres were used to read travelling speeds of E-bikes and a pro forma observation checklist was used to collect data on road riding practice. Mixed-effect logistic regressions were used to calculate adjusted ORs and 95% CIs for the association between speeding, road rule violations and helmet use and their influencing factors., Results: Among 800 E-bikes with a speed reading, 70.9% exceeded the designed speed limit of 20 km/h. Among a further 20 647 E-bikers observed, 38.3% did not comply with the road rules when entering intersections; and only 2.2% wore helmets. No regional variation was identified between urban and rural areas. Male E-bikers were associated with more speeding and road rule violations, whereas riding a pedal-equipped E-bike was associated with less road rule violations and less helmet use., Conclusions: Unsafe riding practices such as speeding, road rule violations and lack of helmet use were commonplace among E-bikers, especially among men. The study findings indicate that measures aimed at improving E-bike safety are required in China.