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Background: A large body of evidence connects access to greenspace with substantial benefits to physical and mental health. In urban settings where access to greenspace can be limited, park access and use have been associated with higher levels of physical activity, improved physical health, and lower levels of markers of mental distress. Despite the potential health benefits of urban parks, little is known about how park usage varies across locations (between or within cities) or over time., Methods: We estimated park usage among urban residents (identified as residents of urban census tracts) in 498 US cities from 2019 to 2021 from aggregated and anonymised opted-in smartphone location history data. We used descriptive statistics to quantify differences in park usage over time, between cities, and across census tracts within cities, and used generalised linear models to estimate the associations between park usage and census tract level descriptors., Findings: In spring (March 1 to May 31) 2019, 18·9% of urban residents visited a park at least once per week, with average use higher in northwest and southwest USA, and lowest in the southeast. Park usage varied substantially both within and between cities; was unequally distributed across census tract-level markers of race, ethnicity, income, and social vulnerability; and was only moderately correlated with established markers of census tract greenspace. In spring 2019, a doubling of walking time to parks was associated with a 10·1% (95% CI 5·6-14·3) lower average weekly park usage, adjusting for city and social vulnerability index. The median decline in park usage from spring 2019 to spring 2020 was 38·0% (IQR 28·4-46·5), coincident with the onset of physical distancing policies across much of the country. We estimated that the COVID-19-related decline in park usage was more pronounced for those living further from a park and those living in areas of higher social vulnerability., Interpretation: These estimates provide novel insights into the patterns and correlates of park use and could enable new studies of the health benefits of urban greenspace. In addition, the availability of an empirical park usage metric that varies over time could be a useful tool for assessing the effectiveness of policies intended to increase such activities., Funding: Google., Competing Interests: Declaration of interests Google provided an unrestricted gift to the Boston University School of Public Health during the time the study was conducted. MTY, SSe, AKu, SSk, YS, SV, MB, Aka, SB, MK, TS, and EG are current or former employees of Google and may own stock or stock options from Google. GAW previously served as a visiting scientist to Google; currently serves as a consultant to the Health Effects Institute (Boston, MA, USA); reports consulting fees from Google and the Health Effects Institute; and his research at Boston University is supported in part by grants from the National Institutes of Health, the US Department of Defense, the Wellcome Trust, the Atlantic Council, and the Health Effects Institute. All other authors declare no competing interests., (Copyright © 2024 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 license. Published by Elsevier Ltd.. All rights reserved.)

Objective: To investigate the effects of discharge opioid supply after surgery for musculoskeletal injury on subsequent opioid use., Study Design: Instrumental variables analysis of retrospective administrative data., Methods: Data were acquired on 1039 patients treated operatively for a musculoskeletal injury between 2011 and 2015 at 2 level I trauma centers. State registry data were used to track all postoperative opioid prescription fills. Discharge surgical resident was identified for each patient. We categorized residents in the top one-third of opioid prescribing as high-supply residents and others as low-supply residents, with adjustment for service attending physician and month. The primary outcome was subsequent opioid use, defined as new opioid prescriptions and cumulative prescribed opioid supply 7 to 8 months after injury., Results: On average, patients of high-supply residents received an additional 96 morphine milligram equivalents (MME) at discharge (95% CI, 29-163 MME; P < .01), or 16% more, compared with patients of low-supply residents, which is equivalent to an additional 2-day supply at a typical dosage. In the seventh or eighth month after surgery, patients of high-supply residents received a greater total MME volume than patients of low-supply residents (difference, 13.0 MME; 95% CI, 3.1-22.9 MME; P < .01) despite receiving a greater cumulative supply of opioid medications through the sixth month after surgery., Conclusions: After surgery for musculoskeletal injury, patients discharged by residents who prescribe greater supplies of opioid pain medications received higher supplies of opioids 7 to 8 months after surgery than patients discharged by residents who tend to prescribe less. Thus, limiting postoperative supplies of opioid pain medication may help reduce chronic opioid use.

Homelessness is poorly captured in most administrative data sets making it difficult to understand how, when, and where this population can be better served. This study sought to develop and validate a classification model of homelessness. Our sample included 5,050,639 individuals aged 11 years and older who were included in a linked dataset of administrative records from multiple state-maintained databases in Massachusetts for the period from 2011-2015. We used logistic regression to develop a classification model with 94 predictors and subsequently tested its performance. The model had high specificity (95.4%), moderate sensitivity (77.8%) for predicting known cases of homelessness, and excellent classification properties (area under the receiver operating curve 0.94; balanced accuracy 86.4%). To demonstrate the potential opportunity that exists for using such a modeling approach to target interventions to mitigate the risk of an adverse health outcome, we also estimated the association between model predicted homeless status and fatal opioid overdoses, finding that model predicted homeless status was associated with a nearly 23-fold increase in the risk of fatal opioid overdose. This study provides a novel approach for identifying homelessness using integrated administrative data. The strong performance of our model underscores the potential value of linking data from multiple service systems to improve the identification of housing instability and to assist government in developing programs that seek to improve health and other outcomes for homeless individuals., Competing Interests: I have read the journal's policy and the authors of this manuscript have the following competing interests: Travis Baggett receives royalties from UpToDate for authorship of a topic review on health care for homeless people. This does not alter our adherence to PLOS ONE policies on sharing data and materials. Marc Dones was employed by a commercial entity, the Center for Social Innovation, at the time work on this manuscript was completed. This does not alter our adherence to PLOS ONE policies on sharing data and materials. No other authors have any competing interests to disclose.

Importance: Racial and ethnic disparities persist across key health and substance use treatment outcomes for mothers and infants. The use of medications, such as methadone or buprenorphine, for the treatment of opioid use disorder (OUD) has been associated with improvements in the outcomes of mothers and infants; however, only half of all pregnant women with OUD receive these medications. The extent to which maternal race or ethnicity is associated with the use of medication to treat OUD, the duration of the use of medication to treat OUD, and the type of medication used to treat OUD during pregnancy are unknown., Objective: To examine the extent to which maternal race and ethnicity is associated with the use of medications for the treatment of OUD in the year before delivery among pregnant women with OUD., Design, Setting, and Participants: This retrospective cohort study used a linked population-level statewide data set of pregnant women with OUD who delivered a live infant in Massachusetts between October 1, 2011, and December 31, 2015. Of 274 234 total deliveries identified, 5247 deliveries among women with indicators of having OUD were included in the analysis. Maternal race and ethnicity were defined as white non-Hispanic, black non-Hispanic, or Hispanic based on self-reported data on birth certificates., Main Outcomes and Measures: Main outcomes were the receipt of any medication for OUD, the consistency of the use of medication (at least 6 continuous months of use before delivery, inconsistent use, or no use) for the treatment of OUD, and the type of medication (methadone or buprenorphine) used to treat OUD. Multivariable models were adjusted for maternal sociodemographic characteristics, comorbidities, and any significant interactions between the covariates and race and ethnicity., Results: The sample included 5247 pregnant women with OUD who delivered a live infant in Massachusetts during the study period. The mean (SD) maternal age at delivery was 28.7 (5.0) years; 4551 women (86.7%) were white non-Hispanic, 462 women (8.8%) were Hispanic, and 234 women (4.5%) were black non-Hispanic. A total of 3181 white non-Hispanic women (69.9%) received any type of medication for the treatment of OUD in the year before delivery compared with 228 Hispanic women (49.4%) and 108 black non-Hispanic women (46.2%). Compared with white non-Hispanic women, black non-Hispanic and Hispanic women had a substantially lower likelihood (adjusted odds ratio [aOR], 0.37; 95% CI, 0.28-0.49 and aOR, 0.42; 95% CI, 0.35-0.52, respectively) of receiving any medication for the treatment of OUD. Stratification by maternal age identified greater disparities among younger women. Black non-Hispanic and Hispanic women also had a lower likelihood (aOR, 0.24; 95% CI, 0.17-0.35 and aOR, 0.34; 95% CI, 0.27-0.44, respectively) of consistent use of medication for the treatment of OUD compared with white non-Hispanic women. With respect to the type of medication used to treat OUD, black non-Hispanic and Hispanic women had a lower likelihood (aOR, 0.60; 95% CI, 0.40-0.90 and aOR, 0.77; 95% CI, 0.58-1.01, respectively) than white non-Hispanic women of receiving buprenorphine treatment compared with methadone treatment., Conclusions and Relevance: This study found racial and ethnic disparities in the use of medications to treat OUD during pregnancy, with black non-Hispanic and Hispanic women significantly less likely to use medications consistently or at all compared with white non-Hispanic women. Further investigation of patient, clinician, treatment program, and system-level factors associated with these findings is warranted.

Background: Inpatient treatment for substance use disorders is a collection of strategies ranging from short term detoxification to longer term residential treatment. How those with opioid use disorder (OUD) navigate this inpatient treatment system after an encounter for detoxification and subsequent risk of opioid-related overdose is not well understood., Methods: We used a comprehensive Massachusetts database to characterize the movement of people with OUD through inpatient care from 2013 to 2015, identifying admissions to inpatient detoxification, subsequent inpatient care, and opioid overdose while navigating treatment. We measured the person-years accumulated during each transition period to calculate rates of opioid-related overdose, and investigated how overdose differed in select populations., Results: Sixty-one percent of inpatient detoxification admissions resulted in a subsequent inpatient detoxification admission without progressing to further inpatient care. Overall, there were 287 fatal and 7337 non-fatal overdoses. Persons exiting treatment after detoxification had the greatest risk of overdose (17.3 per 100 person-years) compared to those who exited after subsequent inpatient care (ranging from 5.9 to 6.6 overdoses per 100 person-years). Non-Hispanic whites were most at risk for opioid related overdose with 16 overdoses per 100 person-years and non-Hispanic blacks had the lowest risk with 5 overdoses per 100 person-years., Conclusions: The majority of inpatient detoxification admissions do not progress to further inpatient care. Recurrent inpatient detoxification admission is common, likely signifying relapse. Rather than functioning as the first step to inpatient care, inpatient detoxification might be more effective as a venue for implementing strategies to expand addiction services or treatment such as medications for opioid use disorder., (Copyright © 2020 Elsevier Inc. All rights reserved.)

Nutrition is a daily challenge for the homeless population in America. Homeless individuals suffer from a high prevalence of diseases related to poor diet, yet there has been little public health effort to improve nutrition in this population. Shelters and soup kitchens may have an untapped potential to impact food access, choice and quality. We offer ideas for intervention and lessons learned from ten shelters and soup kitchens around Greater Boston, MA, USA. By advancing food quality, education and policies in shelters and soup kitchens, the homeless population can be given an opportunity to restore its nutrition and health.

Objectives: We examined factors associated with frequent hospitalizations and emergency department (ED) visits among Medicaid members who were homeless., Methods: We included 6494 Massachusetts Medicaid members who received services from a health care for the homeless program in 2010. We used negative binomial regression to examine variables associated with frequent utilization., Results: Approximately one third of the study population had at least 1 hospitalization and two thirds had 1 or more ED visits. More than 70% of hospitalizations and ED visits were incurred by only 12% and 21% of these members, respectively. Homeless individuals with co-occurring mental illness and substance use disorders were at greatest risk for frequent hospitalizations and ED visits (e.g., incidence rate ratios [IRRs] = 2.9-13.8 for hospitalizations). Individuals living on the streets also had significantly higher utilization (IRR = 1.5)., Conclusions: Despite having insurance coverage, homeless Medicaid members experienced frequent hospitalizations and ED visits. States could consider provisions under the Patient Protection and Affordable Care Act (e.g., Medicaid expansion and Health Homes) jointly with housing programs to meet the needs of homeless individuals, which may improve the quality and cost effectiveness of care.

Introduction: Homeless people have a high burden of cancer risk factors and suboptimal rates of cancer screening, but the epidemiology of cancer has not been well described in this population. We assessed cancer incidence, stage, and mortality in homeless adults relative to general population standards., Methods: We cross-linked a cohort of 28,033 adults seen at Boston Health Care for the Homeless Program in 2003-2008 to Massachusetts cancer registry and vital registry records. We calculated age-standardized cancer incidence and mortality ratios (SIRs and SMRs). We examined tobacco use among incident cases and estimated smoking-attributable fractions. Trend tests were used to compare cancer stage distributions with those in Massachusetts adults. Analyses were conducted in 2012-2015., Results: During 90,450 person-years of observation, there were 361 incident cancers (SIR=1.13, 95% CI=1.02, 1.25) and 168 cancer deaths (SMR=1.88, 95% CI=1.61, 2.19) among men, and 98 incident cancers (SIR=0.93, 95% CI=0.76, 1.14) and 38 cancer deaths (SMR=1.61, 95% CI=1.14, 2.20) among women. For both sexes, bronchus and lung cancer was the leading type of incident cancer and cancer death, exceeding Massachusetts estimates more than twofold. Oropharyngeal and liver cancer cases and deaths occurred in excess among men, whereas cervical cancer cases and deaths occurred in excess among women. About one third of incident cancers were smoking-attributable. Colorectal, female breast, and oropharyngeal cancers were diagnosed at more-advanced stages than in Massachusetts adults., Conclusions: Efforts to reduce cancer disparities in homeless people should include addressing tobacco use and enhancing participation in evidence-based screening., (Copyright © 2015 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.)

Objective: Despite having multiple risk factors, women experiencing homelessness are screened for cervical cancer at a lower rate than women in the general US population. We report on the design of a stated preference study to assess homeless women's preferences for cervical cancer screening interventions, to inform efforts to overcome this disparity., Methods: We conducted focus groups with homeless women (n = 8) on cervical cancer screening decisions and analyzed the data using thematic analysis. We applied inclusion criteria to select factors for a stated preference survey: importance to women, relevance to providers, feasibility, and consistency with clinical experience. We conducted pretests (n = 35) to assess survey procedures (functionality, recruitment, administration) and content (understanding, comprehension, wording/language, length)., Results: We chose best-worst scaling (BWS)-also known as object scaling-to identify decision-relevant screening intervention factors. We chose an experimental design with 11 "objects" (i.e., factors relevant to women's screening decision) presented in 11 subsets of five objects each. Of 25 objects initially identified, we selected 11 for the BWS instrument: provider-related factors: attitude, familiarity, and gender; setting-related factors: acceptance and cost; procedure-related factors: explanation during visit and timing/convenience of visit; personal fears and barriers: concerns about hygiene, addiction, and delivery/fear of results; and a general factor of feeling overwhelmed., Conclusion: Good practices for the development of stated preference surveys include considered assessment of the experimental design that is used and the preference factors that are included, and pretesting of the presentation format. We demonstrate the development of a BWS study of homeless women's cervical cancer screening intervention preferences. Subsequent research will identify screening priorities to inform intervention design.

Homeless women have disproportionately lower rates of cervical cancer screening and higher rates of cervical cancer. In 2008, only 19% of the homeless women seen by Boston Health Care for the Homeless Program (BHCHP) were screened for cervical cancer. To improve screening, BHCHP implemented a 6-part intervention that incorporates point-of-care service, multidisciplinary screening, improved health maintenance forms, population management, process improvement, and increased provider and patient education. This resulted in a significant increase in cervical cancer screening, from 19% in 2008 to 50% in 2013. When compared with national and local cervical cancer screening trends, BHCHP surpassed improvement rates seen in other vulnerable populations. Simple and innovative interventions proved to be the most effective and practical methods of improving screening.

Objectives: We determined the impact of obtaining housing on geriatric conditions and acute care utilization among older homeless adults., Methods: We conducted a 12-month prospective cohort study of 250 older homeless adults recruited from shelters in Boston, Massachusetts, between January and June 2010. We determined housing status at follow-up, determined number of emergency department visits and hospitalizations over 12 months, and examined 4 measures of geriatric conditions at baseline and 12 months. Using multivariable regression models, we evaluated the association between obtaining housing and our outcomes of interest., Results: At 12-month follow-up, 41% of participants had obtained housing. Compared with participants who remained homeless, those with housing had fewer depressive symptoms. Other measures of health status did not differ by housing status. Participants who obtained housing had a lower rate of acute care use, with an adjusted annualized rate of acute care visits of 2.5 per year among participants who obtained housing and 5.3 per year among participants who remained homeless., Conclusions: Older homeless adults who obtained housing experienced improved depressive symptoms and reduced acute care utilization compared with those who remained homeless.

A clinician-randomized trial was conducted using the chronic care model for disease management for alcohol use problems among n = 82 women served in a health care for the homeless clinic. Women with problem alcohol use received either usual care or an intervention consisting of a primary care provider (PCP) brief intervention, referral to addiction services, and on-going support from a care manager (CM) for 6 months. Both groups significantly reduced their alcohol consumption, with a small effect size favoring intervention at 3 months, but there were no significant differences between groups in reductions in drinking or in housing stability, or mental or physical health. However, intervention women had significantly more frequent participation in substance use treatment services. Baseline differences and small sample size limit generalizability, although substantial reductions in drinking for both groups suggest that screening and PCP brief treatment are promising interventions for homeless women with alcohol use problems., (Copyright © 2015 Elsevier Inc. All rights reserved.)

Objectives: We studied 6494 Boston Health Care for the Homeless Program (BHCHP) patients to understand the disease burden and health care utilization patterns for a group of insured homeless individuals., Methods: We studied merged BHCHP data and MassHealth eligibility, claims, and encounter data from 2010. MassHealth claims and encounter data provided a comprehensive history of health care utilization and expenditures, as well as associated diagnoses, in both general medical and behavioral health services sectors and across a broad range of health care settings., Results: The burden of disease was high, with the majority of patients experiencing mental illness, substance use disorders, and a number of medical diseases. Hospitalization and emergency room use were frequent and total expenditures were 3.8 times the rate of an average Medicaid recipient., Conclusions: The Affordable Care Act provides a framework for reforming the health care system to improve the coordination of care and outcomes for vulnerable populations. However, improved health care coverage alone may not be enough. Health care must be integrated with other resources to address the complex challenges presented by inadequate housing, hunger, and unsafe environments.

Background: The average age of the US homeless population is increasing. Little is known about the prevalence of geriatric syndromes in older homeless adults., Objective: To determine the prevalence of common geriatric syndromes in a sample of older homeless adults, and to compare these prevalences to those reported in the general older population., Design: Cross-sectional., Participants: Two hundred and forty-seven homeless adults aged 50-69 recruited from eight homeless shelters in Boston, MA., Main Measures: Interviews and examinations for geriatric syndromes, including functional impairment, cognitive impairment, frailty, depression, hearing impairment, visual impairment, and urinary incontinence. The prevalences of these syndromes in the homeless cohort were compared to those reported in three population-based cohorts., Key Results: The mean age of the homeless cohort was 56.0 years, and 19.8% were women. Thirty percent of subjects reported difficulty performing at least one activity of daily living, and 53.2% fell in the prior year. Cognitive impairment, defined as a Mini-Mental State Examination score <24, was present in 24.3% of participants; impaired executive function, defined as a Trail Making Test Part B duration >1.5 standard deviations above population-based norms, was present in 28.3% of participants. Sixteen percent of subjects met criteria for frailty, and 39.8% had major depression, defined as a score ≥10 on the Patient Health Questionnaire 9. Self-reported hearing and visual impairment was present among 29.7% and 30.0% of subjects, respectively. Urinary incontinence was reported by 49.8% of subjects. After multivariate adjustment for demographic characteristics, homeless adults were more likely to have functional impairment, frailty, depression, visual impairment and urinary incontinence compared to three population-based cohorts of older persons., Conclusions: Geriatric syndromes that are potentially amenable to treatment are common in older homeless adults, and are experienced at higher rates than in the general older population.

Background: Homeless people have high rates of hospitalization and emergency department (ED) use. Obtaining adequate food is a common concern among homeless people and may influence health care utilization., Objective: We tested the hypothesis that food insufficiency is related to higher rates of hospitalization and ED use in a national sample of homeless adults., Design: We analyzed data from the 2003 Health Care for the Homeless (HCH) User Survey., Participants: Participants were 966 adults surveyed at 79 HCH clinic sites throughout the US. The study sample was representative of over 436,000 HCH clinic users nationally., Measures: We determined the prevalence and characteristics of food insufficiency among respondents. Using multivariable logistic regression, we examined the association between food insufficiency and four past-year acute health services utilization outcomes: (1) hospitalization for any reason, (2) psychiatric hospitalization, (3) any ED use, and (4) high ED use (≥ 4 visits)., Results: Overall, 25% of respondents reported food insufficiency. Among them, 68% went a whole day without eating in the past month. Chronically homeless (p = 0.01) and traumatically victimized (p = 0.001) respondents were more likely to be food insufficient. In multivariable analyses, food insufficiency was associated with significantly greater odds of hospitalization for any reason (AOR 1.59, 95% CI 1.07, 2.36), psychiatric hospitalization (AOR 3.12, 95% CI 1.73, 5.62), and high ED utilization (AOR 2.83, 95% CI 1.32, 6.08)., Conclusions: One-fourth of homeless adults in this national survey were food insufficient, and this was associated with increased odds of acute health services utilization. Addressing the adverse health services utilization patterns of homeless adults will require attention to the social circumstances that may contribute to this issue.

Objective: To describe black residents' perceptions of the impact of race on medical training., Materials and Methods: Open-ended interviews were conducted of black physicians in postgraduate year 22 who had graduated from U.S. medical schools and were enrolled in residency programs at one medical school. Using Grounded Theory tenets of qualitative research, data was culled for common themes through repeated readings; later, participants commented on themes from earlier interviews., Results: Of 19 participants 10 were male, distributed evenly among medical and surgical fields. Four major themes emerged from the narratives: discrimination, differing expectations, social isolation and consequences. Participants' sense of being a highly visible minority permeated each theme. Overt discrimination was rare. Participants perceived blacks to be punished more harshly for the same transgression and expected to perform at lower levels than white counterparts. Participants' suspicion of racism as a motivation for individual and institutional behaviors was tempered by self-doubt. Social isolation from participants' white colleagues contrasted with connections experienced with black physicians, support staff and patients, and participants strongly desired black mentors. Consequences of these experiences varied greatly., Conclusions: Black physicians face complex social and emotional challenges during postgraduate training. Creating supportive networks and raising awareness of these issues may improve training experiences for black physicians.

It is challenging to create an educational and satisfying experience in the outpatient setting. We developed a 3-year ambulatory curriculum that addresses the special needs of our categorical medicine residents with distinct learning objectives for each year of training and clinical experiences and didactic sessions to meet these goals. All PGY1 residents spend 1 month on a general medicine ambulatory care rotation. PGY2 residents spend 3 months on an ambulatory block focusing on 8 core medicine subspecialties. Third-year residents spend 2 months on an advanced ambulatory rotation. The curriculum was started in July 2000 and has been highly regarded by the house staff, with statistically significant improvements in the PGY2 and PGY3 evaluation scores. By enhancing outpatient clinical teaching and didactics with an emphasis on the specific needs of our residents, we have been able to reframe the thinking and attitudes of a group of inpatient-oriented residents.