A healthy peer status:Peer preference, not popularity, predicts lower systemic inflammation in adolescence

In adolescence, sensitivity to peers is heightened, which makes peer experiences highly salient. Recent work suggests that these experiences may influence individuals' immune system functioning. Although there is a need to investigate which types of developmental salient social experiences affect inflammation, no studies have examined the role of peer status in inflammatory activity so far. This study is the first to examine the unique role of different types of peer status (i.e., peer preference and peer popularity) on systemic inflammation in adolescence, and the extent to which this association is moderated by early childhood adversity. Participants were 587 Dutch adolescents from the TRacking Adolescents´ Individual Lives Survey (TRAILS). Data were collected when participants were 11 (SD = .56), 13 (SD = .53) and 16 (SD = .71) years old, respectively. At age 11, early childhood adversity (e.g., hospitalization, death within the family) between 0-5 years was assessed via parent interviews. At age 13, peer preference and peer popularity were assessed with peer nominations of classmates. At age 16, high sensitive C-reactive protein (hsCRP), a marker of low-grade systemic inflammation, was assessed with a venipuncture blood draw. Results showed that adolescents who were rated low on peer preference at age 13 exhibited higher levels of hsCRP at age 16. Importantly, these effects remained after controlling for several covariates, including age, sex, peer victimization, smoking behavior, SES, fat percentage, physical activity and temperament. Additionally, we found a positive effect of peer popularity on hsCRP that depended on early childhood adversity exposure. This suggests that for those adolescents who experienced little early childhood adversity, high levels of peer popularity were associated with high levels of hsCRP. Overall, these findings suggest that it is important to take into account the independent roles of peer preference and peer popularity, as specific types of peer status, to better understand adolescent systemic inflammation.</p

Disentangling the effects of peer status and peer victimization on perceived physical health in adolescence

Introduction Although exposure to peer victimization during adolescence has been linked to poorer (perceived) physical health, little is known about how multiple peer stressors may independently and conjointly be related with adolescent physical health outcomes. The current study investigated the unique, interactive, and cumulative effects of peer victimization and two types of peer status (i.e., peer preference and peer popularity) on adolescent perceived physical health, while separating between- and within-person effects. Methods Two hundred and thirty-three adolescents (M-age = 12.7 years; 47.2% females) enrolled in two secondary schools in the Netherlands completed self-report measures and sociometric nominations of peer status four times, every 6 months, during the first 2 years of secondary school. Results Multilevel analysis showed that adolescents who reported higher levels of peer victimization than their peers also reported more perceived physical health problems. Moreover, when adolescents were exposed to higher levels of peer victimization (as compared with their own average levels), they also reported poorer perceived physical health (as compared with their own average levels). No main or interactive effects of peer status were found and the effect of a cumulative peer stress score emerged to be driven by peer victimization. Conclusions Findings revealed both between- and within-person effects of peer victimization on perceived physical health, suggesting that peer victimization may be the most salient peer stressor to affect physical health outcomes in adolescence