Peer victimization and cortisol production in children and adolescents: A systematic review

<p id="p00015">Aggressive behavior plays an important role in the social, emotional and psychological adjustment of children and adolescents. Children and adolescents with aggressive behavior are prone to violate social moral norms, and even commit crimes in serious cases. It is noted that peer victimization is an important predictor of aggressive behavior. Peer victimization refers to that individuals have experienced attacks by peers, such as physical and verbal victimization, attacks on property and social manipulation. Children and adolescents who have been victimized by peers will characterize the attacker as hostility, which will be generalized to the whole peer group, thus showing more aggressive behavior in future interpersonal communication. Several previous studies have examined the relationship between peer victimization and aggressive behavior in children and adolescents. However, due to differences in research design and inconsistent results, there is still some uncertainty about the relationship between peer victimization and aggressive behavior in children and adolescents, and the moderating effect on this relationship is not fully clear. Therefore, the present study employed a three-level meta-analysis to quantitatively synthesize the results of original literatures to obtain reliable estimates of effect sizes and examined a range of moderators (sample, publication, study design, outcome, and assessment characteristics). Through the retrieval of articles published before October 2020, the current meta-analysis identified 40 studies, with 25,605 participants (range of mean age: 6 ~ 19 years) and 333 independent effect sizes. The funnel plot and Egger's test results suggested an absence of publication bias in current meta-analysis. Analysis revealed a significant positive association between peer victimization and aggressive behavior in children and adolescents (<italic>r</italic> = 0.295, <italic>p</italic> &lt; 0.001), implying that children and adolescents showed a higher level of aggressive behavior when they experienced higher level of peer victimization. In addition, the present study found a significant moderating effect of peer victimization variable. Compared with physical victimization (<italic>r</italic> = 0.219, <italic>p</italic> = 0.005), the association between relational victimization (<italic>r</italic> = 0.298, <italic>p</italic> = 0.005) and aggressive behavior in children and adolescents was stronger. Moreover, the overall association was influenced by region. Aggressive behavior in children and adolescents was more strongly associated with peer victimization in Asia (<italic>r</italic> = 0.351, <italic>p</italic> = 0.006) than in South America (<italic>r</italic> = 0.149, <italic>p</italic> = 0.006). Study design was also a significant moderator. The association between peer victimization and aggressive behavior in children and adolescents was smaller in longitudinal (<italic>r</italic> = 0.234, <italic>p</italic> = 0.014) than in cross-sectional studies (<italic>r</italic> = 0.339, <italic>p</italic> = 0.014). Finally, the moderator analyses also showed that the informant of peer victimization was a significant moderator. The strength of the association between peer victimization and aggressive behavior in children and adolescents was significantly stronger when peer victimization was reported by teachers (<italic>r</italic> = 0.476, <italic>p</italic> = 0.023) than by peers (<italic>r</italic> = 0.290, <italic>p</italic> = 0.023). In addition, the present study found that the overall association between peer victimization and aggressive behavior in children and adolescents did not differ in strength across gender, age, publication, variable and informant of aggressive behavior. Moreover, to eliminate the multicollinearity between moderators, the current study built a multivariate model by including all significant moderators that had been identified in the bivariate models. The result indicated that at least one of the regression coefficients of moderators significantly deviates from zero (<italic>F</italic> (12, 316) = 3.973, <italic>p </italic>&lt; 0.001). In sum, the results of the current meta-analysis contribute to a better understanding of the association between peer victimization and aggressive behavior in children and adolescents. These results also provide a reference for future empirical studies on explaining aggressive behavior in children and adolescents.

We document four patterns of sibling victimization (Persist, New, Desist, and None) across two time points and their association with peer victimization at time two and whether these linkages are apparent in early childhood, middle childhood and adolescence. A telephone survey (N = 1653) was conducted with a nationally representative sample of U.S. parents with children (age 3–9) and adolescents (age 10 to 17). The four patterns differed by age, gender, ethnicity and parent education levels but not family structure. The Persist, New and Desist sibling victimization patterns were associated with a greater likelihood of peer victimization. Sibling victimization patterns were unrelated to peer victimization in early childhood but predictive of peer victimization in middle childhood and adolescence. Findings showed that sibling victimization leaves children and adolescents vulnerable to peer victimization. Children and adolescents who experienced chronic sibling victimization (Persist group) were particularly vulnerable to peer victimization. Eliminating sibling victimization could reduce peer victimization in middle childhood and adolescence.

Association between peer victimization in adolescence and cannabis use: A systematic review

We examined associations between peer victimization in early adolescence and self-esteem and internalizing problems in late adolescence and whether these, in turn, explained variation in later parenting. We used longitudinal data from the TRacking Adolescents’ Individual Lives Survey (TRAILS) and its next-generation spin-off study (TRAILS NEXT) to model links between peer victimization reported by individuals themselves, their parents, and their peers at age 11, self-esteem and internalizing problems at age 19, and parental stress and self-efficacy ~10 years later. The used subsample consisted of n = 199 parents (79% female, mean age = 30.48 when offspring were 30 months old) with n = 273 children. Contrary to expectations, peer victimization was not indirectly associated with later parental stress or self-efficacy via self-esteem or internalizing problems at age 19 after adjusting for baseline mental health. Internalizing problems at age 19 consistently predicted higher parental stress in all models. Our findings suggest that early peer victimization experiences have limited long-term effects on parenting, but this might be due to the current assessment of victimization experiences. To better examine the impact of parents’ developmental histories, a more fine-grained measure of peer victimization should be used, taking into account factors such as severity and chronicity.

The role of sleep problems in the relationship between peer victimization and antisocial behavior: A five-year longitudinal study

BackgroundChildhood and peer experiences can influence adolescents’ perceptions of interpersonal relationships, which can, in turn, influence their emotional states and behavior patterns. Non-suicidal self-injury (NSSI) is now a common problem behavior among adolescents. The present study examined the role of childhood trauma and peer victimization in adolescents’ NSSI.MethodsA cross-sectional survey was conducted among 1783 adolescents (1464 girls and 318 boys) in the psychiatric outpatient clinics or wards of 14 psychiatric hospitals or general hospitals in nine provinces in China. Data were collected using the Multidimensional Peer Victimization Scale (MPVS), Short-form Childhood Trauma Questionnaire(CTQ-SF), and Functional Assessment of Self-Mutilation (FASM). Structural equation modeling (SEM) with latent variables was used to demonstrate the mediating role of peer victimization in the association between childhoodtrauma and NSSI.ResultsThe SEM analysis demonstrated that peer victimization plays a partial mediating role in the relationship between childhood trauma and NSSI. In addition, several covariates (such as age, gender, education level, and place of residence) effectively regulated the relationship between peer victimization and NSSI.ConclusionIn future studies of NSSI among Chinese adolescents, attention should be paid to the roles of childhood trauma and peer bullying; there is a temporal sequence between these two variables and, to some extent, childhood trauma can have an impact on bullying during adolescence which, in turn, influences NSSI behavior.

In this preliminary study, we examined peer victimization in adolescents with Down syndrome (DS) and how it relates to language and communication skills. We modified the Childrens' Social Experience Questionnaire (Crick and Grotpeter in Dev Psychopathol 8:367-380, 1996) to better suit adolescents with DS by simplifying vocabulary and syntax, using two step interview response format. Internal reliability was adequate, and all peer victimization measures were significantly elevated compared to a typically developing sample. Further, peer victimization (especially relational victimization) correlated with speech intelligibility, pragmatic judgment, conversational behavior, and receptive vocabulary. These preliminary data suggest that having DS may put adolescents at risk for peer victimization, but having relatively good language/communication skills may be a protective factor. Further research is warranted on this topic.

Indirect effects of HPA axis dysregulation in the association between peer victimization and depressed affect during early adolescence

Given its vicious cycle of victimization, early life adversity (ELA) in childhood may be associated with peer victimization during adolescence. Both ELA and peer victimization have been suggested to be major risk factors for depression. Volumetric alterations in the hippocampus implicated in stress sensitivity have been reported in individuals with ELA and peer victimization. This cross-sectional study examined the moderating role of hippocampal volume in the association between ELA and peer victimization in adolescents with major depressive disorder (MDD). The sample included 78 adolescents with MDD (age M (SD) = 14.92 (1.54) years, 56 females). The Early Trauma Inventory-Short Form and Peer Victimization Scale were used to assess participants’ ELA and peer victimization, respectively. High-resolution structural T1 images were obtained using a Siemens 3T magnetic resonance scanner. Whole hippocampal volumes were segmented and calculated using the FreeSurfer 6.0. Correlation and moderation analyses were also performed. Emotional abuse, a type of ELA, was significantly correlated with peer victimization after controlling for age and sex. The association between emotional abuse and peer victimization was moderated by bilateral hippocampal volume in adolescents with MDD after controlling for age, sex, and intracranial volume. Additionally, the association between emotional abuse and peer victimization was stronger when the bilateral hippocampal volumes were larger. Our findings partially supported the concept of a vicious cycle of victimization, which may be a critical aspect of depression in adolescents. Furthermore, the moderation results suggested that hippocampal volume plays an important role in the victimization cycle in adolescents with MDD.Supplementary InformationThe online version contains supplementary material available at 10.1007/s00787-025-02737-2.

The aim of the current study was to examine whether self-control skills in childhood moderate the association between very preterm birth (<32 weeks of gestational age) and emotional problems and peer victimization in adolescence. We used data from four prospective cohort studies, which included 29,378 participants in total (N = 645 very preterm; N = 28,733 full-term). Self-control was mother-reported in childhood at 5-11 years whereas emotional problems and peer victimization were both self- and mother-reported at 12-17 years of age. Findings of individual participant data meta-analysis showed that self-control skills in childhood do not moderate the association between very preterm birth and adolescence emotional problems and peer victimization. It was shown that higher self-control skills in childhood predict lower emotional problems and peer victimization in adolescence similarly in very preterm and full-term borns.

Given the wide-reaching implications of peer bullying and victimization for children and adolescents as well as increasing public attention to this topic, research in this area has grown during the late 20th and early 21st centuries. Beginning with efforts in Norway in the 1970s, research on bullying and victimization has expanded to include an abundance of research in the United States, Canada, Europe, Australia, and other countries. Regardless of geographic area, important targets of research include defining the constructs (e.g., what is aggression and when does it become bullying or victimization behavior? Are there bullying or victimization behaviors that are more characteristic of males or females?) and understanding the degree to which the problem affects youth (e.g., What are prevalence rates for preschoolers versus school-aged children versus adolescents?). Some studies distinguish between physical or overt forms and social or relational forms of bullying and victimization, but others include measures of general bullying and victimization that do not distinguish among different types. Even with more agreement on definitions, researchers still use different methodologies and measures to study bullying and victimization. A fundamental goal of much of the research literature is to identify predictors and consequences of both bullying and victimization. The correlates and predictors of bullying and victimization exist within multiple contexts and can be grouped into several categories, such as Individual-Level Risk Factors, Family- and Home-Level Risk Factors, Social-Level Risk Factors, and School-Level Risk Factors. Considerable attention has been given to Internalizing Distress and externalizing behavior problems as key outcomes or consequences of bullying and victimization. In addition, other consequences include peer problems and school-related problems. Both cross-sectional and longitudinal studies explore these topics, and a number of useful review articles and meta-analyses provide additional evidence. As researchers have considered more complex models involving risk factors and outcomes associated with bullying and victimization, many have focused on identifying protective factors that might moderate the link between risk factors and victimization or that might function as a buffer against negative outcomes associated with victimization and bullying. Friendship is one such moderator variable with considerable evidence that it disrupts both of these links. The ultimate goal of much of the research on bullying and victimization is to inform the development of effective prevention and intervention efforts. With regard to intervention, research efforts are most often school-based with objectives that include, for example, reducing bullying behaviors, empowering victims, educating teachers, and effectively engaging bystanders.

BackgroundChildhood maltreatment and peer victimization are major risk factors for depression and suicidal behavior. Furthermore, childhood maltreatment increases the risk of peer victimization. Our objective was to distinguish between the contributions of parental maltreatment and peer victimization to the development of mental health problems in young adulthood. Specifically, we tested whether peer victimization alone or in combination with parental maltreatment before 18 years old was associated with anxiety, depression, and suicidal thoughts and behaviors at age 21 years.MethodsWe analyzed data collected from questionnaires administered in the i-Share (Internet-based Students’ Health ResearchEnterprise) study in France from February 2013 to September 2019 (N = 2271 participants). We performed multinomial and binary logistic regression analyses to assess the single and combined contributions of childhood peer victimization and parental maltreatment to anxiety, depression, and suicidality in adulthood.ResultsNearly one third of students (28.8%) reported at least one mental health problem; 29.8% reported peer victimization alone; 7.5% reported parental maltreatment alone; and 10.3% reported both parental maltreatment and victimization. In multivariate models, compared to participants that did not experience maltreatment or peer victimization, those that experienced peer victimization alone were more likely to report anxiety (adjusted odds ratio [aOR]: 1.90; 95% CI: 1.50–2.40), depression (aOR: 1.95; 95% CI: 1.46–2.60), or suicidal ideation, without (aOR: 1.62; 95% CI: 1.26–2.09) or with a suicide attempt (aOR: 2.70; 95% CI: 1.51–4.85). Similar associations were observed for participants that experienced maltreatment alone. Participants that experienced both maltreatment and peer victimization were at increased risk of depression (aOR: 2.63; 95% CI: 1.79–3.86) and suicidal ideation, with (aOR: 9.19; 95% CI: 4.98–16.92) and without a suicide attempt (aOR: 2.64; 95% CI: 1.86–3.76).ConclusionsSeparate and combined exposures to parental maltreatment and peer victimization in childhood or adolescence were associated with increased risks of anxiety, depression, and suicidal behaviors. Peer victimization appeared to play a specific role in mental health disorders that were not otherwise explained by polyvictimization. Currently, peer victimization is a frequent, but avoidable type of child abuse; therefore, these findings have implications for policies for preventing and dealing with peer victimization.

Childhood maltreatment and adolescents’ peer victimization: The effect of security, school connectedness and gender

BackgroundAttentional processes are influenced by both stimulus characteristics and individual factors such as mood or personal experience. Research has suggested that attentional biases to socially relevant stimuli may occur in individuals with a history of peer victimization in childhood and adolescence. Based on this, the present study aimed to examine attentional processes in response to emotional faces at both the behavioral and neurophysiological levels in participants with experiences of peer victimization.MethodsIn a sample of 60 adult participants with varying severity of retrospectively reported peer victimization in childhood and adolescence, the dot-probe task was administered with angry, disgusted, sad, and happy facial expressions. In addition to behavioral responses, physiological responses (i.e., event-related potentials) were analyzed.ResultsAnalyses of mean P100 and P200 amplitudes revealed altered P200 amplitudes in individuals with higher degrees of peer victimization. Higher levels of relational peer victimization were associated with increased P200 amplitudes in response to facial expressions, particularly angry and disgusted facial expressions. Hierarchical regression analyses showed no evidence for an influence of peer victimization experiences on reaction times or P100 amplitudes in response to the different emotions.ConclusionCortical findings suggest that individuals with higher levels of peer victimization mobilize more attentional resources when confronted with negative emotional social stimuli. Peer victimization experiences in childhood and adolescence appear to influence cortical processes into adulthood.

To investigate the developmental course of aggression and peer victimization in childhood and adolescence, distinct subgroups of children were identified based on similarities and differences in their physical, verbal and relational aggression, and victimization. Developmental continuity and change were assessed by examining transitions within and between subgroups from Grades 1 to 11. This longitudinal study consisted of 482 children (50% females) and was based on peer report data on multiple forms of aggression and peer victimization. Using person-centered methods including latent profile and latent transition analyses, most of the identified subgroups were distinguishable by their frequencies (i.e., levels) of aggression and victimization, rather than forms (physical, verbal, and relational), with the exception of 1 group that appeared to be more form-specific. Across subgroups, multiple developmental patterns emerged characterized as early and late-onset, social interactional continuity, desistance, and heterotypic pathways. Collectively, these pathways support the perspective that the development of aggression and peer victimization in childhood and adolescence is characterized by heterogeneity. (PsycINFO Database Record