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Overweight in youth is influenced by genes and environment. Gene-environment interaction (G×E) has been demonstrated in twin studies and recent developments in genetics allow for studying G×E using individual genetic predispositions for overweight. We examine genetic influence on trajectories of overweight during adolescence and early adulthood and determine whether genetic predisposition is attenuated by higher socioeconomic status and having physically active parents. Latent class growth models of overweight were fitted using data from the TRacking Adolescents' Individual Lives Survey (n = 2720). A polygenic score for body mass index (BMI) was derived using summary statistics from a genome-wide association study of adult BMI (N = ∼700,000) and tested as predictor of developmental pathways of overweight. Multinomial logistic regression models were used to examine effects of interactions of genetic predisposition with socioeconomic status and parental physical activity (n = 1675). A three-class model of developmental pathways of overweight fitted the data best ("non-overweight", "adolescent-onset overweight", and "persistent overweight"). The polygenic score for BMI and socioeconomic status distinguished the persistent overweight and adolescent-onset overweight trajectories from the non-overweight trajectory. Only genetic predisposition differentiated the adolescent-onset from the persistent overweight trajectory. There was no evidence for G×E. Higher genetic predisposition increased the risk of developing overweight during adolescence and young adulthood and was associated with an earlier age at onset. We did not find that genetic predisposition was offset by higher socioeconomic status or having physically active parents. Instead, lower socioeconomic status and higher genetic predisposition acted as additive risk factors for developing overweight. [ABSTRACT FROM AUTHOR]

Our society faces a great diversity of opportunities for youth. The 10-year Growing Up Together in Society (GUTS) program has the long-term goal to understand which combination of measures best predict societal trajectories, such as school success, mental health, well-being, and developing a sense of belonging in society. Our leading hypothesis is that self-regulation is key to how adolescents successfully navigate the demands of contemporary society. We aim to test these questions using socio-economic, questionnaire (including experience sampling methods), behavioral, brain (fMRI, sMRI, EEG), hormonal, and genetic measures in four large cohorts including adolescents and young adults. Two cohorts are designed as test and replication cohorts to test the developmental trajectory of self-regulation, including adolescents of different socioeconomic status thereby bridging individual, family, and societal perspectives. The third cohort consists of an entire social network to examine how neural and self-regulatory development influences and is influenced by whom adolescents and young adults choose to interact with. The fourth cohort includes youth with early signs of antisocial and delinquent behavior to understand patterns of societal development in individuals at the extreme ends of self-regulation and societal participation, and examines pathways into and out of delinquency. We will complement the newly collected cohorts with data from existing large-scale population-based and case-control cohorts. The study is embedded in a transdisciplinary approach that engages stakeholders throughout the design stage, with a strong focus on citizen science and youth participation in study design, data collection, and interpretation of results, to ensure optimal translation to youth in society. [ABSTRACT FROM AUTHOR]

Bullying is a serious problem that affects millions of individuals worldwide each year. In response to this, thousands of research articles have been published on bullying. Unfortunately, much of bullying research remains largely atheoretical in its approach to defining bullying as a unique form of aggression. Another key problem in bullying research is the proliferation of heterogeneity of bullying measures whose validity is sometimes questionable. Combined, these two problems have made progress difficult as comparisons between studies and results are impeded by a lack of commonality. As a solution to these problems a discussion of the issues surrounding defining and measuring bullying is offered. This paper aims to promote thoughts and insights about the critical issues and concepts facing those who seek to define and measure bullying for research, intervention, or policy work. Although suggestions for best practices are offered, the overriding goal is to promote all practices that enhance the validity, transparency, and compatibility of bullying research. The time seems right for a general call to action for researchers to individually produce data that are both theoretically and empirically more communicable to the broader bullying community. [ABSTRACT FROM AUTHOR]

This study investigates among ethnic minority adolescents how friendships with ethnic minority and majority group peers are related to their attitudes towards the majority outgroup. Friendships with majority group peers are proposed to be indirectly related to outgroup attitudes through host society identification. Friendships with ethnic ingroup peers are proposed to be indirectly related to outgroup attitudes through ethnic ingroup identification. Hypotheses were tested longitudinally among ethnic minority adolescents ( n = 244) who recently entered middle schools in the Netherlands. Lagged structural equation models showed that friendships with majority group peers were related to stronger identification with the host society which was in turn related to improved attitudes toward the majority outgroup. Ingroup friendships and ingroup identification was not related to outgroup attitudes. Additional analyses indicated that the relation between host society identification and majority group friendships was bidirectional. [ABSTRACT FROM AUTHOR]

Abstract: Purpose: Low heart rate (HR) has been linked to antisocial behavior (ASB). However, the effect of low HR may be mediated by affiliation with bullies. We hypothesized that individuals with low HR are more likely to affiliate with bullies and in turn are influenced by these peers. Methods: Data come from two waves of a subsample of the TRAILS study (N = 809; 44.0% boys; mean age of 11.0 years at T1 and 13.5 years at T2). ASB was measured using the Antisocial Behavior Questionnaire at both waves. HR was assessed during rest at T1. Affiliation with bullies was assessed via peer nominations at T1. Possible gender differences were taken into account, and all analyses were adjusted for family context (i.e., family breakup and socioeconomic status). Results: Regression analyses showed that lower HR was only associated with ASB in (pre)adolescents who affiliated with bullies. Moreover, the effect of lower HR on boys'' ASB was partly mediated by affiliation with bullies. Conclusions: Our findings show that (pre)adolescents, and in particular boys, seem to be in environments that match their biological disposition and in turn are shaped by this environment. [Copyright &y& Elsevier]

Abstract: Purpose: A disputed social status among peers puts children and adolescents at risk for developing a wide range of problems, such as being bullied. However, there is a lack of knowledge about which early predictors could be used to identify (young) adolescents at risk for a disputed social status. The aim of this study was to assess whether preventive child health care (PCH) findings on early childhood predict neglected and rejected status in early adolescence in a large longitudinal community-based sample. Methods: Data came from 898 participants who participated in TRAILS, a longitudinal study. Information on early childhood factors was extracted from the charts of routine PCH visits registered between infancy and age of 4 years. To assess social status, peer nominations were used at age of 10–12 years. Results: Multinomial logistic regression showed that children who had a low birth weight, motor problems, and sleep problems; children of parents with a low educational level (odds ratios [ORs] between 1.71 and 2.90); and those with fewer attention hyperactivity problems (ORs = .43) were more likely to have a neglected status in early adolescence. Boys, children of parents with a low educational level, and children with early externalizing problems were more likely to have a rejected status in early adolescence (ORs between 1.69 and 2.56). Conclusions: PCH findings on early childhood—on motor and social development—are predictive of a neglected and a rejected status in early adolescence. PCH is a good setting to monitor risk factors that predict the social status of young adolescents. [Copyright &y& Elsevier]

Abstract: Research on adolescents’ interethnic relations indicates that parents can resist their children''s ethnic outgroup relations. However, there is little insight into the underlying reasons for this. The current study examines how cultural groups differ in parental acceptance of their children''s outgroup relations, and it examines the role of perceived family reputation vulnerability as well as parents’ religiosity. In addition, it was investigated whether parental acceptance of outgroup relations differs for different outgroups. This was studied among Turkish (n =49) and Dutch (n =73) parents of first grade middle school students. Parental acceptance of intimate ethnic outgroup relations was lower among Turkish–Dutch than among Dutch parents. This difference was explained by group differences in perceived family reputation vulnerability and religiosity. It is concluded that concerns about culture transmission and family reputation are related to parental acceptance of outgroup contact, which explains differences in parental acceptance between cultural groups. In addition, status considerations seem to explain differences in parental acceptance of their children''s close contacts with different outgroups. [Copyright &y& Elsevier]

Abstract: Purpose: To examine the relative contribution of weapon carrying of peers, aggression, and victimization to weapon carrying of male and female adolescents over time. Methods: Data were derived from a population-based sample of male (N = 224) and female (N = 244) adolescents followed from grade 10 (M age = 15.5) to grade 11 (M age = 16.5). Peer networks were derived from best friend nominations. Self-reports were used to assess weapon carrying. Aggression and victimization were assessed using both self- and peer-reports. Use of dynamic social network modeling (SIENA) allowed prediction of weapon carrying in grade 11 as a function of weapon carrying of befriended peers, aggression, and victimization in grade 10, while selection processes and structural network effects (reciprocity and transitivity) were controlled for. Results: Peer influence processes accounted for changes in weapon carrying over time. Self-reported victimization decreased weapon carrying 1 year later. Peer-reported victimization increased the likelihood of weapon carrying, particularly for highly aggressive adolescents. Boys were more likely to carry weapons than girls, but the processes associated with weapon carrying did not differ for boys and girls. Conclusions: These findings revealed that, in this population-based sample, weapon carrying of best friends, as well as aggression, contributed to the proliferation of weapons in friendship networks, suggesting processes of peer contagion as well as individual vulnerability to weapon carrying. [Copyright &y& Elsevier]

The article offers information on the study of TRacking Adolescents' Individual Lives Survey (TRAILS) regarding the relationship of antisocial behavior (ASB) with low heart rate (HR). It says that the study on several Dutch boys and girls aged 11- 25 shows variation, wherein at age of 16, boys with lower HR were risky for rule breaking and aggression, but both are not during preadolescent period. It concludes that HRs were associated with ASB on boys, who are higher on surgency and adventurism.

Objective: To examine whether school absenteeism is a perpetuating factor of functional somatic symptoms and whether this holds true for bullied adolescents. Study design: This study is part of the longitudinal population-based study Tracking Adolescents’ Individual Lives Survey. Data from assessment wave 2 (n = 2149; 51.0% girls; mean age = 13.65, SD = 0.53) and assessment wave 3 (n = 1816; 53.3% girls; mean age = 16.25, SD = 0.72) were used. Peer victimization was assessed by peer nominations, school absenteeism by both parent and teacher reports, and functional somatic symptoms with the Youth Self-Report. Results: With structural equation modeling, school absenteeism at the second wave, adjusted for functional somatic symptoms at the second wave, was revealed to predict functional somatic symptoms at the third wave in the entire cohort (β = 0.12; 95% CI, 0.02-0.22), but not in the subgroup of bullied adolescents (β = −0.13; 95% CI, −0.62-−0.26). However, the difference between bullied and unbullied adolescents did not reach significance. Conclusion: This study provides evidence that school absenteeism is a perpetuating factor of functional somatic symptoms in adolescents. A clinical intervention study is necessary to examine whether preventing school absenteeism truly helps to reduce functional somatic symptoms in adolescents. [ABSTRACT FROM AUTHOR]

Objective To examine whether early manifestations of attention-deficit/hyperactivity disorder (ADHD) and oppositional defiant disorder (ODD) increase children's later risk of bullying or victimization. Method Using a population-based, prospective cohort, our multi-informant approach comprised reports of parents, teachers, and peers. ADHD and ODD behavioral problems at ages 1.5, 3, and 5 years were determined from parental reports on the Child Behavior Checklist. Later bullying behavior at school was reported by teachers using a questionnaire (n = 3,192, mean age 6.6 years), and by peer/self-reports using peer nominations (n = 1,098, mean age 7.6 years). We examined the following: whether problem behavior scores at age 1.5, 3, or 5 years predicted a risk of bullying involvement; and whether high or increasing behavioral problems throughout ages 1.5 to 5 years were associated with bullying involvement at school. Analyses were adjusted for a range of child and maternal covariates. Results Behavioral problems at a young age each predicted later bullying involvement at school. For example, higher ADHD problem scores at age 3 years were associated with the risks of becoming a bully or a bully-victim (ORBULLY = 1.20, 95% CI = 1.07-1.35 [teacher report], ORBULLY-VICTIM = 1.28, 95% CI = 1.14-1.43 [teacher report], and ORBULLY-VICTIM = 1.35, 95% CI = 1.03-1.78 [peer/self-report]). Children whose behavioral problem scores were high or increased over time consistently had elevated risks of becoming a bully or a bully-victim. Conclusion Behavioral problems at a young age may predispose children to bullying involvement in early elementary school. [ABSTRACT FROM AUTHOR]

Abstract: Aims: To assess the influence of peer alcohol use during adolescence on young adults' alcohol use and abuse, and to assess to what extent parents' perception of their adolescent child's friends and adolescent's self-control modify this influence. Methods: We analyzed data from the first, third, and fourth wave of a population-based prospective cohort study of 2230 adolescents conducted between 2001 and 2010 (mean ages: 11.1, 16.3, and 19.1, respectively). Alcohol use and abuse were measured at T4 by self-report questionnaires and by the Composite International Diagnostics Interview (CIDI), respectively. Peer alcohol use, self-control, and parents' perception of their adolescent child's friends were measured at T3. We adjusted for gender, age, socioeconomic-status, parental alcohol use, and adolescent baseline alcohol use. Results: Peer alcohol use during adolescence was related to young adults' alcohol use and abuse [odds ratio (95% confidence interval): 1.31 (1.11–1.54) and 1.50 (1.20–1.87), respectively]. Neither parents' perception of their adolescent child's friends nor self-control modified this relationship. Alcohol abusers were more likely to have low self-control than alcohol users. No differences were found between alcohol users and abusers regarding their parents' perception of their friends and peer alcohol use. Conclusions: Peer alcohol use during adolescence affects young adults' alcohol use and abuse. We found that self-control was only related to alcohol abuse. Peer influence was not modified by parents' perception of peers or by self-control. Peer alcohol use and self-control should thus be separate targets in the prevention of alcohol use/abuse. [Copyright &y& Elsevier]

Sexual minority youth report poorer mental health than heterosexual youth. According to the minority stress framework, this results from sexual minority individuals being societally marginalized, which for sexual minority youth may include being poorly integrated in the peer context. A sociometric approach was used to test whether peer relationships, measured broadly as friendship, acceptance, disliking, and bullying relationships, mediated the link between a sexual minority orientation and depressive symptoms in adolescence. Analyses were conducted across three samples from the Netherlands and Belgium (N = 352; N = 1848; N = 263). Sexual minority respondents reported higher levels of depressive symptoms than heterosexual respondents, yet sexual orientation differences in peer relationships were small. Moreover, no link between peer relationships and depressive symptoms was found. Consequently, indirect effects were small too. • Results from Three Independent Samples Are Reported. • Sexual Minority Youth Had More Depressive Symptoms than Heterosexual Youth. • Sexual Orientation Differences Peer Relationships Were Small. • The Effects of Peer Relationships on Depressive Symptoms Were Small. [ABSTRACT FROM AUTHOR]

This paper examined the association between friendship and academic networks and how the connections these networks have with academic performance and school misconduct differ when comparing three types of classrooms where students were grouped based on their academic ability (i.e., high-, low-, and mixed-ability). The sample was composed of 528 seventh to ninth graders (M age = 15; 64.1% girls) from 12 classrooms (four in each category of ability grouping) across two waves in five schools in Chile. The effects of academic performance and school misconduct on receiving academic and friendship nominations were examined, as well as the interplay between academic and friendship relationships. Furthermore, the extent to which similarity in adolescents' academic performance and school misconduct contributed to the formation and maintenance of academic and friendship relationships was examined. Sex, socioeconomic status, and structural network features were also taken into account. Longitudinal social network analyses (RSiena) indicated that (1) in high-ability classrooms students chose high-achieving peers as academic partners; (2) in high-ability classrooms students avoided deviant peers (i.e., those high in school misconduct) as academic partners; and (3) academic relationships led to friendships, and vice versa, in both high- and low-ability classrooms. Whereas the interplay of friendship and academic relationships was similar in high- and low-ability classrooms, the formation and maintenance of academic networks unfolded differently in these two types of classrooms. [ABSTRACT FROM AUTHOR]

Although students are part of a group of classmates, they spend the majority of time during lessons with students who are seated next or close to them. Therefore, near-seated peers in elementary school classrooms might play a crucial role in students' academic development. It was hypothesized that near-seated peers influence students' academic engagement and achievement, especially when they are also friends. Participants were 559 fourth-sixth grade students (21 classrooms; 51.9% boys; M age = 10.65 years, range = 8–12). Longitudinal social network analysis (RSiena) showed that students' academic engagement and achievement got better when friends scored better, and vice versa, regardless of their physical position in the classroom. In contrast, near-seated peers who were not befriended got more diverse scores over time. These results imply that teachers should consider students' friendships and academic engagement and achievement in designing seating arrangements. Moreover, it is recommended to actively monitor ongoing peer influence processes. [ABSTRACT FROM AUTHOR]

Defending is considered important in reducing bullying and victimization in schools. Yet, the prevalence of defending is quite low and there is little insight into aspects that explain why students intervene in bullying situations. The current study used a longitudinal design to simultaneously examine the antecedents and status outcomes of defending behavior. It was expected that affective and social-cognitive factors explain involvement in defending. Moreover, it was proposed that defending would be rewarded with popularity among peers, but only for defenders who were not victimized themselves. Unconflated multilevel path models were used and data came from students in grades 4–6 of Finnish elementary schools ( N = 4209 students from 210 classrooms and 38 schools; M age 11.25; 50% boys). Affective empathy and students' self-efficacy beliefs were predictive of defending behavior over time, whereas cognitive empathy was not. Additionally, defenders increased their popularity among their peers. No substantial differences between victims and non-victims were found. This pattern of results suggests that, irrespective of victim status, specific children are more likely to defend in bullying situations and are rewarded with increased popularity. [ABSTRACT FROM AUTHOR]

Using data from 2413 Dutch first-year secondary school students ( M age = 13.27, SD age = 0.51, 49.0% boys), this study investigated as to what extent students who according to their self-reports had not been victimized (referred to as reporters ) gave victimization nominations to classmates who according to their self-reports had been victimized (referred to as receivers ). Using a dyadic approach, characteristics of the reporter–receiver dyad (i.e., gender similarity) and of the reporter (i.e., reporters' behavior during bullying episodes) that were possibly associated with reporter–receiver agreement were investigated. Descriptive analyses suggested that numerous students who were self-reported victims were not perceived as victimized by their non-victimized classmates. Three-level logistic regression models (reporter–receiver dyads nested in reporters within classrooms) demonstrated greater reporter–receiver agreement in same-gender dyads, especially when the reporter and the receiver were boys. Furthermore, reporters who behaved as outsiders during bullying episodes (i.e., reporters who actively shied away from the bullying) were less likely to agree on the receiver's self-reported victimization, and in contrast, reporters who behaved as defenders (i.e., reporters who helped and supported victims) were more likely to agree on the victimization. Moreover, the results demonstrated that reporters gave fewer victimization nominations to receivers who reported they had been victimized sometimes than to receivers who reported they had been victimized often / very often . Finally, this study suggested that reporter–receiver agreement may not only depend on characteristics of the reporter–receiver dyad and of the reporter, but on classroom characteristics as well (e.g., the number of students in the classroom). [ABSTRACT FROM AUTHOR]