The bidirectional associations between self-esteem and problematic eating behaviors in adolescents

OBJECTIVE

Theories propose that low self-esteem and problematic eating behaviors (PEBs) negatively impact each other. While previous studies suggested bidirectional associations between self-esteem and PEBs, they did not separate within-person from between-person associations. Therefore, this prospective study investigated the within-person bidirectional associations between self-esteem and four PEBs in adolescence, while accounting for between-person differences.

METHOD

We used two independent longitudinal samples of Dutch adolescents, each including three annually collected waves of data. Sample 1 consisted of 1856 adolescents (Baseline: 50.4% males; Mage  = 13.79 years, SDage  = 0.72), with measures of self-esteem, emotional eating, restrained eating, and loss of control (LOC) while overeating. Sample 2 consisted of 555 adolescents (Baseline: 49.7% males; Mage  = 13.13 years, SDage  = 0.68), with measures of self-esteem and LOC eating. The data were analyzed using random intercept cross-lagged panel models (CLPMs).

RESULTS

Within persons, lower self-esteem was associated with higher emotional and restrained eating (both Sample 1) one year later, and vice versa. Self-esteem did not predict, nor was predicted by, LOC while overeating (Sample 1) or LOC eating (Sample 2). Between persons, self-esteem was negatively correlated with all PEBs (Samples 1 and 2).

DISCUSSION

We found within-person bidirectional associations between low self-esteem and emotional and restrained eating (but not LOC while overeating/LOC eating), and between-person correlations between low self-esteem and all PEBs. These results have theoretical and practical implications. Within-person processes clarify underlying mechanisms that explain the occurrence of PEBs; between-person associations are important to identify adolescents at risk of PEBs.

PUBLIC SIGNIFICANCE

While theories indicate that low self-esteem and PEBs are inversely associated within individuals, empirical studies have not disentangled within-person processes from between-person differences. This study addressed this disparity, finding that lower self-esteem was bidirectionally associated with higher emotional and restrained eating (but not LOC eating) within persons. These findings suggest that enhancing self-esteem is a viable option for prevention and intervention.

Understanding the behavioral determinants of adolescents' water consumption: A cross-country comparative study

Substituting the consumption of sugar-sweetened beverages (SSB) with that of water can have a positive effect on adolescents' health. However, despite the attention on this topic in the Global North, it is relatively understudied in other regions of the world, such as the Caribbean. To guide the development of future interventions, understanding the factors determining water consumption among Caribbean adolescents is important. This study examined the behavioral determinants of water consumption among adolescents in Aruba (the Caribbean) and compared them to those in the Netherlands (Western Europe). We used a theoretical model that integrates the dominant theoretical perspectives in the field of public health, including theories of planned behavior, social norms, and intrinsic motivation. This cross-country study included 1,584 adolescents from Aruba and the Netherlands (52% girls; M = 12.34 years; SD = 2.14). The data were analyzed using regression analyses. This study found that in Aruba, adolescents with higher scores of intrinsic motivation, friends' descriptive norms, attitudes, and behavioral control regarding water consumption drank more water. Moreover, the associations between water consumption and both intrinsic motivation as well as friends' descriptive norms for adolescents in Aruba were stronger than those found in the Netherlands. These associations imply that it is even more important for Aruban adolescents than Dutch adolescents to be intrinsically motivated or to perceive their friends often consuming water to drink more water. The cross-country comparison implies that future interventions in Aruba aimed at increasing adolescents' water consumption as an alternative to SSB should focus on enhancing their intrinsic motivation while considering their friends' social norms.

Self-esteem and negative affectivity as mediators of the prospective links between adolescent interpersonal peer problems and disordered eating behaviors

The current prospective study examined whether both self-esteem and negative affectivity mediate subsequent associations between interpersonal peer problems (i.e., peer victimization, peer rejection, lack of friendships) and disordered eating behaviors (i.e., loss of control while overeating, emotional eating, restrained eating) in adolescents using secondary data. The sample included 2051 adolescents (M_age baseline = 13.81, SD_age baseline = 0.72; 48.5% female) who participated in a longitudinal project, which includes three annually collected waves of data. Participants completed self-report and peer-report measures describing interpersonal problems with peers, and self-report measures describing negative affectivity, self-esteem, and disordered eating behaviors. The results provided no support for either self-esteem or negative affectivity as mediators of the associations between interpersonal peer problems and disordered eating behaviors two years later. However, self-esteem was more robustly linked to all three types of subsequent disordered eating behaviors than negative affectivity. This highlights the importance of adolescent's self-evaluations in the development of disordered eating behaviors.

Efficacy and moderators of short-term psychodynamic psychotherapy for depression: A systematic review and meta-analysis of individual participant data

BACKGROUND

Short-term psychodynamic psychotherapy (STPP) is frequently used to treat depression, but it is unclear which patients might benefit specifically. Individual participant data (IPD) meta-analyses can provide more precise effect estimates than conventional meta-analyses and identify patient-level moderators. This IPD meta-analysis examined the efficacy and moderators of STPP for depression compared to control conditions.

METHODS

PubMed, PsycInfo, Embase, and Cochrane Library were searched September 1st, 2022, to identify randomized trials comparing STPP to control conditions for adults with depression. IPD were requested and analyzed using mixed-effects models.

RESULTS

IPD were obtained from 11 of the 13 (84.6%) studies identified (n = 771/837, 92.1%; mean age = 40.8, SD = 13.3; 79.3% female). STPP resulted in significantly lower depressive symptom levels than control conditions at post-treatment (d = -0.62, 95%CI [-0.76, -0.47], p < .001). At post-treatment, STPP was more efficacious for participants with longer rather than shorter current depressive episode durations.

CONCLUSIONS

These results support the evidence base of STPP for depression and indicate episode duration as an effect modifier. This moderator finding, however, is observational and requires prospective validation in future large-scale trials.

The effect of a multi-component school-based social network intervention on children's body mass index: a four-arm intervention study

Objective: Schools are considered an important setting for stimulating healthy weight. The current study is unique in examining effects of a multi-component school-based social network intervention on children's body mass index z-scores (zBMI).Methods: Four schools were randomly allocated to one of four conditions: a social network intervention using influence agents focusing on water consumption, physical activity, a combination of the two, or a passive control condition. Participants included a total of 201 6- to-11-year-old children (53.7% girls; Mage = 8.51, SDage = 0.93). At baseline, 149 (76.0%) participants had a healthy weight, 29 (14.8%) had overweight and 18 (9.2%) had obesity.Results: Linear mixed effect models indicated that a multi-component school-based social network intervention targeting both water consumption and physical activity was most effective in decreasing children's zBMI.Conclusion: This study suggests that schools can contribute to the intervention of childhood obesity-even without involving the parents-by targeting both children's water consumption and physical activity through influential peers, but more research is needed to identify mechanisms of change.

Process and effect evaluation of the app-based parenting program Samen Happie! on infant zBMI: A randomized controlled trial

Background

Although energy balance-related parenting practices are regarded critical components in the prevention of childhood obesity, most programs targeting parenting practices with respect to a wide range of energy balance-related behaviors were not aimed at high-risk families with a lower socioeconomic position (SEP).

Objective

The Samen Happie! app-based program aimed to stimulate healthy child weight development especially among families with a lower SEP, by encouraging healthy energy balance-related parenting practices.

Methods

A two-armed randomized controlled trial examined the process and effectiveness of the Samen Happie! program on child zBMI outcomes at 6- and 12-months follow-up. In total, 357 Dutch parents with infants aged 5-15 months old at baseline participated. Parents in the app condition (n = 179) received access to the Samen Happie! app and were compared to a waitlist-control condition (n = 178). Changes in zBMI were examined through linear mixed-effects models based on intention-to-treat and exploratory per-protocol principles.

Results

Process data showed low levels of sustained app use and moderate app acceptability. A general increase in child zBMI was observed in both conditions after 6 and 12 months. Intention-to-treat analyses using multiple imputations showed several statistically significant differences between conditions and high-risk subgroups. Specifically, at 6-months follow-up, zBMI increase was least pronounced in the app condition among children of parents with lower educational level. These findings were supported by exploratory per-protocol analyses including only frequent app users. In addition, per-protocol analyses showed benefits of app use at 6-months follow-up for children of parents with higher BMI. However, these effects were reversed at 12-months follow-up in both intention-to-treat and per-protocol analyses, where children of parents in the app condition in general increased the most in zBMI.

Conclusions

This study suggests that the Samen Happie! program might prevent zBMI increases after 6 months among children of parents with lower educational level, and children of parents with higher BMI who more frequently use the app. However, the app did not prevent increases in zBMI after 12 months. Future research should investigate strategies to increase sustained app use and engagement in mHealth parenting programs for childhood obesity as well as options to combine app-based programs with additional support strategies aimed at high-risk families.

Trial registration

Netherlands trial register (ID: NTR6938), https://trialsearch.who.int/Trial2.aspx?TrialID=NTR6938.

Adolescents' food intake changes during the COVID-19 pandemic: The moderating role of pre-pandemic susceptibility, COVID-19 related stressors, and the social food context

Although insight in how adolescents' food intake is affected by the COVID-19 pandemic is critical, knowledge is limited. Hence, this longitudinal study (N = 691, Mage = 14.30, SDage = 0.62; 52.5% female) investigated changes in adolescents' unhealthy (sugar-sweetened beverages, sweet snacks, savoury snacks) and healthy (fruit and vegetables) food intake (in total, obtained from home, and from outside the home) from pre-pandemic (Spring 2019) to the first lockdown (Spring 2020) and to six months later (Fall 2020). Moreover, several moderating factors were assessed. Results showed that the intake of unhealthy and healthy food in total and obtained from outside the home decreased during the lockdown. Six months later, unhealthy food intake returned to pre-pandemic levels, while healthy food intake remained lower. COVID-19 stressful life events and maternal food intake further qualified these longer-term changes in intake of sugar-sweetened beverages and fruit and vegetables, respectively. Future work is warranted to elucidate longer-term COVID-19 effects on adolescents' food intake.

Examining food intake similarities in adolescent best friend dyads using longitudinal Actor-Partner Interdependence Models

Little is known about how adolescent best friends may affect each other's food intake. This study explored whether friendship selection and socialization mechanisms explained potential food intake similarities in adolescent reciprocated best friend dyads. We also tested whether socialization processes were moderated by dyad member's relative zBMI. Members of 145 same-gender best friendship dyads (56% female; Mage = 12.79; SDage = 0.61) reported on their intake of food obtained from home and from outside the home at the beginning and the end of the school year through food frequency questionnaires. Longitudinal Actor-Partner Interdependence Models results showed no indication of selection or socialization, and very limited evidence for the moderation of socialization processes by relative zBMI. These findings indicate that focusing on adolescent reciprocated best friends in dietary interventions may not be valuable.

Assessing Peer Influence and Susceptibility to Peer Influence Using Individual and Dyadic Moderators in a Social Network Context: The Case of Adolescent Alcohol Misuse

Higher accepted friends are known to influence the alcohol misuse of lower accepted friends, but not the reverse. The present study was designed to address the origins of this influence: Are higher accepted friends particularly influential or are lower accepted friends particularly susceptible to influence? To address this question, we introduce an innovative application of longitudinal social network techniques (RSIENA) designed to distinguish being influential from being susceptible to influence. The results revealed that influence was a product of heightened susceptibility among low accepted adolescents, rather than heightened influence among high accepted adolescents. The findings are consistent with claims that low accepted youth fear the consequences of nonconformity and adjust their behavior to more closely resemble their affiliates.

With a little help from my empathic friends: The role of peers in the development of empathy in adolescence

Despite ample research on empathy development, its social origins have been understudied, particularly in the context of peer relations. This two-wave study of Swedish adolescents (N = 318; M_ageT1 = 16.28, SD = .49; 55% females) examined longitudinal associations between youth friendships and empathy. The results showed that adolescents befriended peers with similar levels of empathy and that, controlling for the initial similarity in empathy, youth who had more empathic friends increased in empathy over time compared with youth with less empathic friends. These selection and influence effects were comparable for the affective and cognitive empathy components (i.e., empathic concern and perspective taking). These results provide strong evidence for the role of friendships in the development of empathy. They underscore the importance of peer-based, social-emotional programs to foster adolescent empathy. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Emerging Adults' Mental Health During the COVID-19 Pandemic: A Prospective Longitudinal Study on the Importance of Social Support

The aim of this longitudinal study was to investigate emerging adults' mental health before and during the COVID-19 pandemic, and whether social support from mothers, fathers, and best friends moderated the change in mental health. Participants were 98 emerging adults (46% men) who were assessed prior to COVID-19 (M _age = 20.60 years) and during the first lockdown (M _age = 22.67 years). Results indicated that the pandemic did not uniformly lead to elevated levels of mental health problems, but instead depended on level of mental health problems prior to COVID-19 and the source of support. For emerging adults who already experienced more problems prior to COVID-19, more maternal support was related to decreases in general psychological distress and depressive symptoms, whereas more paternal support was related to increases in general psychological distress and depressive symptoms. Support from best friends were not associated with (changes in) mental health.

Promoting water consumption among Dutch children: an evaluation of the social network intervention Share H2O

Background

There is a need to develop and improve interventions promoting healthy drinking behaviors among children. A promising method could be to stimulate peer influence within children’s social networks. In the Share H₂O social network intervention (SNI), peer influence was utilized by selecting a subset of influential children and training them as ‘influence agents’ to promote water consumption—as an alternative to SSBs. Previous research has mainly focused on the process of selecting influence agents. However, the process of motivating influence agents to promote the behavior has hardly received any research attention. Therefore, in the SNI Share H₂O SNI, this motivation process was emphasized and grounded in the self-determination theory (SDT). This study evaluated the implementation of the Share H₂O SNI, focusing on whether and how applying SDT-based techniques can motivate the influence agents and, indirectly, their peers.

Methods

This study included data collected in the Netherlands from both the influence agents (n = 37) and the peers (n = 112) in the classroom networks of the influence agents.

Self-reported measurements assessed the influence agents’ enjoyment of the training, duration and perceived autonomy support during the training, and changes in their intrinsic motivation and water consumption before and after the start of the intervention. Changes in the peers’ intrinsic motivation, perceived social support, and social norms were measured before and after the start of the intervention.

Results

The influence agents enjoyed the training, the duration was adequate, and perceived it as autonomy supportive. There was an increase in the influence agents’ intrinsic motivation to drink water and their actual water consumption. Providing personal meaningful rationales seemed to have motivated the influence agents. The intrinsic motivation and perceived descriptive norm of the peers remained stable. The peers reported an increase in their perceived social support and injunctive norm concerning water drinking after the intervention. Influence agents appeared to mainly use face-to-face strategies, such as modeling, talking to peers, and providing social support to promote the behavior.

Conclusions

The current findings provided preliminary evidence of the promising effects of using SDT-based techniques in an SNI to motivate the influence agents and, indirectly, their peers.

Trial registration

NTR, NL6905, Registered 9 January 2018, https://www.trialregister.nl/trial/6905

A Longitudinal Social Network Perspective on Adolescents' Exposure to Violent Video Games and Aggression

Adolescents play video games as a social leisure activity, yet it is unclear whether peer influences play a role in spreading violent video game exposure (VVE) and aggression. It has been suggested that adolescents' aggression increases because of their friend's exposure to violent video games. This study tests this suggestion by using longitudinal social network analyses to investigate selection and socialization of aggression owing to VVE. A total of 796 adolescents from 34 different classrooms were followed from grade 7 to grade 8 (M_age = 12.60 years, 51 percent male adolescents). Exposure to violent video games, physical aggression, and within-classroom friendships were assessed at both time points. Data were analyzed by means of stochastic actor-based modeling in RSiena to estimate the effects of VVE and aggressive behavior on changes in friendships (selection), and the effects of friendships on changes in participants' VVE and aggressive behavior (socialization). Results showed homotypic selection effects, that is, adolescents became friends with peers who were similar in aggression and similar in violent video game exposure. Furthermore, there was a homotypic socialization effect, as friends became more similar in aggression over time. Friends did not become more similar in VVE over time. Violent games played by friends did not increase adolescents' own aggressive behavior. This suggests that concerns about peer influences on violent video games are unwarranted. Future studies on socialization processes of VVE should focus on influences from closest friends and investigate behavior during actual play.

A Dyadic Test of the Association Between Trait Self-Control and Romantic Relationship Satisfaction

Previous research has demonstrated that trait self-control is related to a range of positive romantic relationship processes, suggesting that trait self-control should be positively and robustly linked to relationship satisfaction in both partners in a romantic relationship. However, the existing empirical evidence is limited and mixed, especially regarding partner effects (i.e., the effect of one's self-control on the partner's relationship satisfaction). With three datasets of heterosexual couples (S1: N = 195 newlyweds, longitudinal; S2: N = 249 couples who transition into first parenthood, longitudinal; S3: N = 929 couples, cross-sectional), the present pre-registered studies examined: (1) the dyadic associations between trait self-control and relationship satisfaction both cross-sectionally and longitudinally, and (2) whether these effects hold when controlling for both partners' relationship commitment. The results indicated a cross-sectional positive actor effect, some support for a positive cross-sectional partner effect, and only little support for a longitudinal actor (but not partner) effect. After controlling for relationship commitment, all effects of trait self-control on satisfaction diminished except for a longitudinal actor effect among women in Study 2. Potential explanations for the current results, and implications for theory and practice, are discussed.

Schema therapy with exposure and response prevention for the treatment of chronic anxiety with comorbid personality disorder

Background and objectives

A considerable group of patients with anxiety disorders do not respond to guideline CBT treatment, possibly due to comorbid personality disorder (PD) traits. Schema therapy (ST) is an integrative treatment for personality disorders, and preliminary evidence suggests that it also affects anxiety. The present study examined the effects of a combination treatment (‘SCHerp’: ST + exposure and response prevention) in a non‐responsive outpatient group suffering from chronic anxiety and comorbid cluster C personality disorder.

Methods

Psychological malfunction (n = 42), and adaptive and maladaptive schema modes (n = 49) were assessed pre‐ and post‐treatment.

Results

Patients showed statistically significant decreases in psychological malfunction and maladaptive modes, and significant increases in adaptive modes from pre‐ to post‐treatment. Changes in modes were correlated with changes in psychological malfunction.

Limitations

No control group or follow‐up measurements were included.

Conclusions

The combination of ST and exposure with response prevention may be a viable avenue for research and treatment for this subpopulation. However, further research is needed to confirm and enhance effectiveness and identify working mechanisms of SCHerp.

Practitioner points

The SCHerp programme combines schema therapy with exposure and response prevention to tackle chronic anxiety in patients with comorbid personality disorder

SCHerp significantly reduced psychological malfunction and maladaptive modes, and increased adaptive modes

Changes in schema modes correlated with changes in psychological malfunction, suggesting that schema modes are an appropriate treatment target in this population

No active control group was included so no therapy‐specific factors can be determined at this stage

Food parenting practices and children's weight outcomes: A systematic review of prospective studies

This systematic review is the first to provide an overview of the prospective links between food parenting practices and children's weight outcomes. Three databases were searched. All titles, abstracts and full-texts were double screened by two independent reviewers. Peer-reviewed journal articles published after 1990 assessing the prospective association between food parenting practices and weight outcomes of children aged 2-18 years were eligible. A total of 38 eligible studies were identified, focusing on 12 separate food parenting practices. Restriction, pressure to eat, and monitoring were generally not associated with children's weight over time, but higher quality studies suggest that pressure to eat was associated with lower weight outcomes over time. Most studies on food availability and accessibility found null-findings as well. Instrumental-but not emotional-feeding was associated with higher weight over time, but higher quality studies are needed to confirm this link. Results involving the link between frequency of mealtime and child weight were mixed. Autonomy supporting and other structure-related food parenting practices were understudied. In conclusion, food parenting practices receiving the most attention within prospective studies (i.e., restriction, pressure to eat, monitoring) were generally not associated with children's weight outcomes over time. Future high quality studies should focus more on other food parenting practices, further unravel bidirectional links between food parenting and children's eating behaviors and weight outcomes, and examine the mediating role of dietary intake.

Exploring the directionality in the relationship between descriptive and injunctive parental and peer norms and snacking behavior in a three-year-cross-lagged study

Background

People’s eating behavior is assumed to be influenced by what other people do (perceived descriptive norms) and what others approve of (perceived injunctive norms). It has been suggested that adolescents are more susceptible to peer norms than parental norms, because they experience a strong need for group acceptance that leads to conforming to peer group norms. The current study examined changes in snacking behavior and four types of social norms (i.e., parental and peer descriptive and injunctive norms) that promoted fruit and vegetable intake among adolescents. This study was the first to examine whether snacking behavior also influenced norm perceptions by testing the directionality of these associations.

Methods

The study consisted of 819 participants (M [SD] age = 11.19 [1.36]; 46.1% boys), collected at three time points (T1 = 2016, T2 = 2017 and T3 = 2018) during the MyMovez project. Self-reported frequency of snack consumption, perceived parental and peer descriptive and injunctive norms were assessed. The primary analysis consisted of a series of cross-lagged autoregressive models specified in a structural equation modeling framework.

Results

Model comparisons testing the descriptive and injunctive norms in separate models and in an additional combined model revealed evidence for bi-directional associations between norms and snacking behavior. Descriptive peer and parent norms were not found to have an effect on subsequent snacking behaviors. Perceived injunctive parental norms were positively associated with healthy snack food intake and negatively associated with unhealthy snack intake (forward direction). Injunctive peer norms were negatively associated with healthy snack food intake. In addition, higher unhealthy snack food intake was negatively associated with the perception of descriptive and injunctive parental norms 1 year later (reversed direction). We did not find peer norms to be more closely associated with changes in snacking behaviors compared to parental norms.

Conclusions

Parents expecting their children to snack healthy had a positive influence on healthy snacking behavior whereas only acting as a healthy role model did not. Future research should address the possible interaction between descriptive and injunctive norms. Research should also take into account the bi-directional relations between eating behaviors and normative perceptions.

Testing a Social Network Intervention Using Vlogs to Promote Physical Activity Among Adolescents: A Randomized Controlled Trial

There is a need to stimulate physical activity among adolescents, but unfortunately, they are hard to reach with traditional mass media interventions. A promising alternative is to carry out social network interventions. In social network interventions, a small group of individuals (influence agents) is selected to promote health-related behaviors within their social network. This study investigates whether a social network intervention is more effective to promote physical activity, compared to a mass media intervention and no intervention. Adolescents (N = 446; M_age = 11.35, SD_age = 1.34; 47% male) were randomly allocated by classroom (N = 26, in 11 schools) to one of three conditions: social network intervention, mass media intervention, or control condition. In the social network intervention, 15% of the participants (based on peer nominations) was approached to become an influence agent, who created vlogs about physical activity that were shown during the intervention. In the mass media intervention, participants were exposed to vlogs made by unfamiliar peers (i.e., vlogs of the social network intervention). The control condition did not receive vlogs about physical activity. All participants received a research smartphone to complete questionnaires and a wrist-worn accelerometer to measure physical activity. The trial was registered a priori in the Dutch Trial Registry (NTR6903). There were no differences in objectively measured physical activity between this social network intervention and the control condition in the short-term, but there was an unexpected increase in the control condition compared to the social network intervention in the long-term. No differences between the social network intervention and mass media intervention were observed. The current study does not provide evidence that this social network intervention is effective in increasing physical activity in adolescents. Exploratory analyses suggest that this social network intervention increased the perceived social norm toward physical activity and responses to the vlogs were more positive in the social network intervention than in the mass media intervention. These initial results warrant further research to investigate the role of the social norms and the added benefit of using influence agents for social network interventions.

Clinical Trial Registration:https://www.trialregister.nl/, identifier NTR6903.

Addiction-Focused Eye Movement Desensitization and Reprocessing Therapy as an Adjunct to Regular Outpatient Treatment for Alcohol Use Disorder: Results From a Randomized Clinical Trial

BACKGROUND

This study examined the feasibility, safety, and efficacy of addiction-focused eye movement desensitization and reprocessing (AF-EMDR) treatment, as an add-on intervention to treatment as usual (TAU).

METHODS

Adult outpatients with alcohol use disorder (AUD) (N = 109) who already received or had just started with TAU (Community Reinforcement Approach) were recruited at 6 outpatient addiction care facilities. They were randomly assigned to either TAU + 7 weekly 90-minute sessions of AF-EMDR (N = 55) or TAU-only (N = 54). Assessments were made at baseline, after AF-EMDR therapy (+ 8 weeks in the TAU-only group), and at 1- and 6-month follow-up. The primary outcomes were changes in drinking behavior as reported by the participant and biomarker indices.

RESULTS

Data were analyzed as intent-to-treat with linear mixed models. Additionally, sensitivity analyses were performed. No group or interaction effects were found for any of the outcome variables. Only limited change over time was seen with regard to indices of personal and societal recovery and in some secondary indices of clinical recovery (craving, desire thinking, and rumination). Reliable Change Index calculations showed that more TAU-only participants showed clinical improvement with regard to alcohol consumption while a somewhat higher proportion of participants in the TAU + AF-EMDR group experienced less craving. The acceptability, safety, and feasibility of the treatments received in both groups were comparable.

CONCLUSIONS

There was no add-on effect of AF-EMDR on TAU with regard to drinking behavior in outpatients with an AUD. Possible explanations are discussed. Future studies should first establish proof of principle regarding the potential of AF-EMDR therapy to disrupt operant learning and habits relevant in addiction.

Behavioral classroom norms in special education: Associations with peer acceptance and rejection

This study investigated the role of behavioral norms on concurrent links between problem behaviors (externalizing problems, internalizing problems, attention–hyperactivity problems) and social status (acceptance, rejection) in special education classrooms at four time points within and across school years. Two opposing models were considered, the “person–group similarity model,” suggesting moderation of behavioral norms, and the “social skill model,” suggesting no moderation. The sample included a total of 580 pupils (88% boys, Mage Time1 = 10.82 years, SD = .86) attending 37 classrooms from 13 Dutch schools for special education. Multilevel analyses revealed that the data generally supported a “social skill model,” meaning that higher individual levels of attention–hyperactivity problems and externalizing problems were related to lower acceptance and higher rejection, independent of behavioral norms. Support for behavioral norms as moderators of the link between individual behaviors and social status was limited to pupils with attention–hyperactivity problems being less rejected in classrooms in which this behavior was normative. In sum, these results provide an initial exploration of the role of behavioral norms in special education. Various explanations for the results, including special education characteristics and the value of behavioral norms, are discussed.

Psychometric Validation of the Dutch Version of the Desire Thinking Questionnaire (DTQ-D)

Abstract. Desire thinking refers to verbal and imaginal elaboration of a desired target. It predicts escalations in craving intensity and subsequent alcohol use. This article aimed to determine the psychometric properties of the Dutch version of the Desire Thinking Questionnaire (DTQ-D). In Study 1, a confirmatory factor analysis provided support for the original two-factor solution, achieved with adequate internal consistency. The DTQ-D demonstrated partial invariance over time. In Study 2, convergent validity with measures of craving was demonstrated. Discriminant validity with measures of severity of alcohol use and perseverative thinking was satisfactory. Concurrent validity was established by comparing three distinctive groups of alcohol users with increasing levels of drinking: a normative and an out- and in-patient sample. The normative group scored significantly lower on the DTQ-D than the clinical groups. Within the normative sample a low and higher at-risk drinking group could be distinguished. Overall, the DTQ-D possesses reasonable psychometric properties for use with alcohol-drinking samples. However, additional psychometric evaluation in larger clinical samples as well as in other addictions is warranted.

Identifying Influence Agents That Promote Physical Activity Through the Simulation of Social Network Interventions: Agent-Based Modeling Study

Background

Social network interventions targeted at children and adolescents can have a substantial effect on their health behaviors, including physical activity. However, designing successful social network interventions is a considerable research challenge. In this study, we rely on social network analysis and agent-based simulations to better understand and capitalize on the complex interplay of social networks and health behaviors. More specifically, we investigate criteria for selecting influence agents that can be expected to produce the most successful social network health interventions.

Objective

The aim of this study was to test which selection criterion to determine influence agents in a social network intervention resulted in the biggest increase in physical activity in the social network. To test the differences among the selection criteria, a computational model was used to simulate different social network interventions and observe the intervention’s effect on the physical activity of primary and secondary school children within their school classes. As a next step, this study relied on the outcomes of the simulated interventions to investigate whether social network interventions are more effective in some classes than others based on network characteristics.

Methods

We used a previously validated agent-based model to understand how physical activity spreads in social networks and who was influencing the spread of behavior. From the observed data of 460 participants collected in 26 school classes, we simulated multiple social network interventions with different selection criteria for the influence agents (ie, in-degree centrality, betweenness centrality, closeness centrality, and random influence agents) and a control condition (ie, no intervention). Subsequently, we investigated whether the detected variation of an intervention’s success within school classes could be explained by structural characteristics of the social networks (ie, network density and network centralization).

Results

The 1-year simulations showed that social network interventions were more effective compared with the control condition (beta=.30; t100=3.23; P=.001). In addition, the social network interventions that used a measure of centrality to select influence agents outperformed the random influence agent intervention (beta=.46; t100=3.86; P<.001). Also, the closeness centrality condition outperformed the betweenness centrality condition (beta=.59; t100=2.02; P=.046). The anticipated interaction effects of the network characteristics were not observed.

Conclusions

Social network intervention can be considered as a viable and promising intervention method to promote physical activity. We demonstrated the usefulness of applying social network analysis and agent-based modeling as part of the social network interventions’ design process. We emphasize the importance of selecting the most successful influence agents and provide a better understanding of the role of network characteristics on the effectiveness of social network interventions.

Effects of a non-eating confederate on food intake do not persist for everyone over time when people are left alone: An exploratory study

An extensive body of research has established that eating with others can have inhibitory effects on food intake. Recent findings suggest that these effects may (partly) persist over time when the eating norm is no longer enforced. To gain more insights into the persistence of effects of a live non-eating stranger, the main aim of the present study is to explore how food intake of young women changes as a result of previous exposure to a non-eating confederate (i.e., adult stranger). To address this aim, an experiment was conducted in which 64 young women, aged 17 to 26 (M = 19.81, SD = 1.95), were given access to chocolates at two different time points. First, participants were all paired with a non-eating stranger (i.e., confederate). Afterwards, half of the participants remained with the non-eating stranger (i.e., together-together condition), while the other half was left alone with the food (i.e., together-alone condition). Results indicated that participants who were left alone increased their intake on average, although raw data revealed interesting individual differences. In contrast, most of the participants who remained with the non-eating stranger did not increase intake. Participants in an ad hoc added control condition (i.e., no exposure to a non-eating confederate; alone-alone condition; n = 26) showed food intake similar to participants in the together-alone condition after they were left alone. Our findings suggest that if intake behaviors are too extreme and divergent from the desire to eat as much as possible, women may, on average, only adhere to these behaviors in the presence of others.

Friendly fire: Longitudinal effects of exposure to violent video games on aggressive behavior in adolescent friendship dyads

Research on gaming effects has focused on adolescence, a developmental period in which peer relationships become increasingly salient. However, the impact of peers on the effects of violent gaming on adolescents has been understudied. This study examined whether adolescents’ exposure to violent video games predicted their own and their friend's aggression one year later. Among 705 gaming adolescents, 141 dyads were identified based on reciprocated best friend nominations (73.8% male, M_age = 13.98). Actor‐Partner Interdependence Models indicated that adolescent males’ (but not females’) exposure to violent games positively predicted the aggression of their best friend 1 year later. This effect appeared regardless of whether the friends played video games together or not. The study illustrates the importance of peers in the association between violent gaming and aggression.

A randomized controlled trial testing a social network intervention to promote physical activity among adolescents

BACKGROUND

The current study examined the effectiveness of a social network intervention to promote physical activity among adolescents. Social network interventions utilize peer influence to change behavior by identifying the most influential individuals within social networks (i.e., influence agents), and training them to promote the target behavior.

METHOD

A total of 190 adolescents (46.32% boys; M age = 12.17, age range: 11-14 years) were randomly allocated to either the intervention or control condition. In the intervention condition, the most influential adolescents (based on peer nominations of classmates) in each classroom were trained to promote physical activity among their classmates. Participants received a research smartphone to complete questionnaires and an accelerometer to measure physical activity (steps per day) at baseline, and during the intervention one month later.

RESULTS

A multilevel model tested the effectiveness of the intervention, controlling for clustering of data within participants and days. No intervention effect was observed, b = .04, SE = .10, p = .66.

CONCLUSION

This was one of the first studies to test whether physical activity in adolescents could be promoted via influence agents, and the first social network intervention to use smartphones to do so. Important lessons and implications are discussed concerning the selection criterion of the influence agents, the use of smartphones in social network intervention, and the rigorous analyses used to control for confounding factors.

TRIAL REGISTRATION

Dutch Trial Registry (NTR): NTR6173 . Registered 5 October 2016 Study procedures were approved by the Ethics Committee of the Radboud University (ECSW2014-100614-222).

Youth's social network structures and peer influences: study protocol MyMovez project - Phase I

Background

Youth are an important target group for social network interventions, because they are particularly susceptible to the adaptation of healthy and unhealthy habits and behaviors of others. They are surrounded by ‘social influence agents’ (i.e., role models such as family, friends and peers) that co-determine their dietary intake and physical activity. However, there is a lack of systematic and comprehensive research on the implementation of a social network approach in health campaigns. The MyMovez research project aims to fill this gap by developing a method for effective social network campaign implementation. This protocol paper describes the design and methods of Phase I of the MyMovez project, aiming to unravel youth’s social network structures in combination with individual, psychosocial, and environmental factors related to energy intake and expenditure. In addition, the Wearable Lab is developed to enable an attractive and state-of-the-art way of collecting data and online campaign implementation via social networks.

Methods

Phase I of the MyMovez project consists of a large-scale cross-sequential cohort study (N = 953; 8-12 and 12-15 y/o). In five waves during a 3-year period (2016-2018), data are collected about youth’s social network exposure, media consumption, socialization experiences, psychological determinants of behavior, physical environment, dietary intake (snacking and drinking behavior) and physical activity using the Wearable Lab. The Wearable Lab exists of a smartphone-based research application (app) connected to an activity tracking bracelet, that is developed throughout the duration of the project. It generates peer- and self-reported (e.g., sociometric data and surveys) and experience sampling data, social network beacon data, real-time physical activity data (i.e., steps and cycling), location information, photos and chat conversation data from the app’s social media platform Social Buzz.

Discussion

The MyMovez project - Phase I is an innovative cross-sequential research project that investigates how social influences co-determine youth’s energy intake and expenditure. This project utilizes advanced research technologies (Wearable Lab) that provide unique opportunities to better understand the underlying processes that impact youths’ health-related behaviors. The project is theoretically and methodologically pioneering and produces a unique and useful method for successfully implementing and improving health campaigns.

Electronic supplementary material

The online version of this article (10.1186/s12889-018-5353-5) contains supplementary material, which is available to authorized users.

Mother-adolescent conflict types and adolescent adjustment: A person-oriented analysis

This investigation was designed to identify dyadic differences in mother-adolescent conflict. In 2 studies (N = 131 and N = 147), adolescents (M = 13.88 and 14.65 years old) described the number of disagreements with mothers during the previous (1 or 3) days, their affective intensity, and perceptions of negativity in the relationship. Cluster analyses yielded 3 unique groups that replicated across studies: (a) placid dyads (50% of Study 1 participants and 36% of Study 2 participants), notable for low disagreement affective intensity and low relationship negativity; (b) explosive dyads (25% of Study 1 participants and 31% of Study 2 participants), notable for high affective intensity; and (c) squabbling dyads (25% of Study 1 participants and 33% of Study 2 participants), notable for frequent conflict. Longitudinal analyses revealed that cluster group membership was stable from 1 year to the next. Follow-up analyses indicated that adolescents in placid dyads had lower levels of internalizing and externalizing problem behaviors than those in the explosive or squabbling dyads, concurrently and prospectively. (PsycINFO Database Record

Group Functioning in Child Care Centers

This article introduces and conceptually underpins an instrument to measure group functioning in child care groups, the Group Functioning Instrument for Child Care (GFI-CC). This instrument was applied in 44 Dutch child care groups (0- to 4-year-olds). The results of this first explorative investigation with the GFI-CC provided initial support for an underlying conceptual model of group functioning in child care centers based on cohesion (network structure, action coordination, and involvement) and emotional climate. The relation between group functioning and structural group characteristics was also examined. Mean age and group continuity (i.e., how long the children have already been attending the group) predicted group functioning, with higher group functioning in groups with older children and in groups with greater continuity. Group size and group constancy (i.e., how many days a week children attend the child care group together) did not independently contribute to the prediction of the group functioning variables.

Beyond dyadic interdependence: Actor-oriented models for co-evolving social networks and individual behaviors

Actor-oriented models are described as a longitudinal strategy for examining the co-evolution of social networks and individual behaviors. We argue that these models provide advantages over conventional approaches due to their ability to account for inherent dependencies between individuals embedded in a social network (i.e., reciprocity, transitivity) and model interdependencies between network and behavioral dynamics. We provide a brief explanation of actor-oriented processes, followed by a description of parameter estimates, model specification, and selection procedures used by the Simulation Investigation for Empirical Network Analyses (SIENA) software program (Snijders, Steglich, Schweinberger, & Huisman, 2006). To illustrate the applicability of these models, we provide an empirical example investigating the co-evolution of friendship networks and delinquent behaviors in a longitudinal sample of Swedish adolescents with the goal of simultaneously assessing selection and influence processes. Findings suggest both processes play a substantive role in the observed dynamics of delinquent behaviors, with influence having a relatively stronger role than selection (especially in reciprocated friendships).

Adolescent perceptions of friendship and their associations with individual adjustment

This study of 282 dyads examines early- and mid-adolescents' perceptions of friendship quality and their association with daily disagreements, self- and mother reports of behaviour problems, and school grades. Actor and partner analyses identify unique associations between perceptions of friendship quality and perceptions of daily conflict. Actor effects reveal links between friendship negativity and self-perceptions of conflict affective intensity, relationship impact, post-conflict interaction, and post-conflict separation, and between friendship positivity and self-perceptions of relationship impact. Partner effects reveal links between friendship negativity and partner perceptions of conflict outcomes. Perceptions of relationship quality were also associated with self- and mother reports of behaviour problems and with school grades, such that individual and dyadic views of friendship negativity were linked to detrimental outcomes. The worst outcomes tended to be reserved for dyads in which one or both friends reported high levels of relationship negativity.

A social network-based intervention stimulating peer influence on children's self-reported water consumption: A randomized control trial

The current pilot study examined the effectiveness of a social network-based intervention using peer influence on self-reported water consumption. A total of 210 children (52% girls; M age = 10.75 ± SD = 0.80) were randomly assigned to either the intervention (n = 106; 52% girls) or control condition (n = 104; 52% girls). In the intervention condition, the most influential children in each classroom were trained to promote water consumption among their peers for eight weeks. The schools in the control condition did not receive any intervention. Water consumption, sugar-sweetened beverage (SSB) consumption, and intentions to drink more water in the near future were assessed by self-report measures before and immediately after the intervention. A repeated measure MANCOVA showed a significant multivariate interaction effect between condition and time (V = 0.07, F(3, 204) = 5.18, p = 0.002, pη(2) = 0.07) on the dependent variables. Further examination revealed significant univariate interaction effects between condition and time on water (p = 0.021) and SSB consumption (p = 0.015) as well as water drinking intentions (p = 0.049). Posthoc analyses showed that children in the intervention condition reported a significant increase in their water consumption (p = 0.018) and a decrease in their SSB consumption (p < 0.001) over time, compared to the control condition (p-values > 0.05). The children who were exposed to the intervention did not report a change in their water drinking intentions over time (p = 0.576) whereas the nonexposed children decreased their intentions (p = 0.026). These findings show promise for a social network-based intervention using peer influence to positively alter consumption behaviors.

TRIAL REGISTRATION

This RCT was registered in the Australian New Zealand Clinical Trials Registry (ACTRN12614001179628). Study procedures were approved by the Ethics Committee of the Faculty of Social Sciences at Radboud University (ECSW2014-1003-203).

One-sided and mutually aggressive couples: Differences in attachment, conflict prevalence, and coping

This study investigated concurrent links between adolescent romantic couples' reports of aggression (relational and physical) and relationship functioning (e.g., attachment security, conflict prevalence, coping strategies, jealousy, and affiliative and romantic relationship quality) using a pattern-oriented approach. The sample included 194 romantic partner dyads (Mage=16.99 years for females and Mage=18.41 years for males). A hierarchical cluster analysis identified five distinct subgroups of dyads based on male and female reports of relational and physical aggression, ranging from nonaggressive couples (42%), to those characterized by aggressive females (18%), aggressive males (14%), physically aggressive females (20%), and mutually aggressive females and males (6%). Clusters in which one partner was perceived as either relationally or physically aggressive were characterized by higher rates of conflict, less adaptive coping, and more jealousy (particularly in males). The mutually aggressive couples showed the least adaptive relationship functioning, with high rates of conflict, a deficit in reflection and emotion regulation in conflict situations, and a lack of affiliative relationship qualities. The discussion focuses on the formative character of aggression in these early romantic relations, the aggravating impact of mutual aggression on relationship functioning, and the gender-specific functions of aggression in relationships characterized by unilateral aggression.

Identifying Subgroups among Hardcore Smokers: a Latent Profile Approach

INTRODUCTION

Hardcore smokers are smokers who have little to no intention to quit. Previous research suggests that there are distinct subgroups among hardcore smokers and that these subgroups vary in the perceived pros and cons of smoking and quitting. Identifying these subgroups could help to develop individualized messages for the group of hardcore smokers. In this study we therefore used the perceived pros and cons of smoking and quitting to identify profiles among hardcore smokers.

METHODS

A sample of 510 hardcore smokers completed an online survey on the perceived pros and cons of smoking and quitting. We used these perceived pros and cons in a latent profile analysis to identify possible subgroups among hardcore smokers. To validate the profiles identified among hardcore smokers, we analysed data from a sample of 338 non-hardcore smokers in a similar way.

RESULTS

We found three profiles among hardcore smokers. 'Receptive' hardcore smokers (36%) perceived many cons of smoking and many pros of quitting. 'Ambivalent' hardcore smokers (59%) were rather undecided towards quitting. 'Resistant' hardcore smokers (5%) saw few cons of smoking and few pros of quitting. Among non-hardcore smokers, we found similar groups of 'receptive' smokers (30%) and 'ambivalent' smokers (54%). However, a third group consisted of 'disengaged' smokers (16%), who saw few pros and cons of both smoking and quitting.

DISCUSSION

Among hardcore smokers, we found three distinct profiles based on perceived pros and cons of smoking. This indicates that hardcore smokers are not a homogenous group. Each profile might require a different tobacco control approach. Our findings may help to develop individualized tobacco control messages for the particularly hard-to-reach group of hardcore smokers.

Impulsive and reflective processes related to alcohol use in young adolescents

BACKGROUND

Dual process models suggest that the development of addictive behaviors is the result of interplay between impulsive and reflective processes, modulated by boundary conditions such as individual or situational factors. Empirical support for this model has been repeatedly demonstrated in adult samples [for a meta-analysis, see Ref. (1)]. The purpose of this study was to test these processes as they relate to emerging alcohol use in adolescents. Specifically, the interactive effects of several measures of impulsive and reflective processes and working memory capacity (WMC) are examined as predictors of changes in alcohol use among adolescents. It was expected that measures of reflective processes would better predict changes in alcohol use than measures of impulsive processes. Moreover, it was anticipated that WMC would moderate the relation between alcohol-specific impulsive and reflective processes and changes in adolescent alcohol use.

METHODS

The sample consisted of 427 adolescents (47.7% male) between 12 and 16 years of age (M = 13.96, SD = 0.78) who reported drinking alcohol at least once. Four measures of impulsive processes were included. Attentional bias for alcohol was assessed with a Visual Probe Test; approach bias toward alcohol was assessed with a Stimulus Response Compatibility (SRC) Test; and memory associations with alcohol were assessed with an Implicit Association Test (IAT) and a Word Association Test. Two measures of reflective measures were included: positive and negative expectancies. WMC was measured using a Self-Ordered Pointing Task.

RESULTS

RESULTS showed that positive expectancies predicted changes in alcohol use, but this effect was qualified by an interaction with IAT scores. Moreover, SRC scores predicted changes in alcohol use only when negative expectancies were low. Attentional bias and word association scores did not predict changes in alcohol use. The relations between alcohol-specific processes or reflective processes and alcohol use were not moderated by WMC.

CONCLUSION

Although there is empirical evidence for the validity of the model in predicting heavier alcohol use in adolescents, or alcohol abuse and dependence in adults, these observations do not generalize to a sample of normative, early adolescents. More specifically, results indicated that reflective processes are more important predictors of changes in alcohol use than impulsive process during adolescence.

Direct and Indirect Peer Socialization of Adolescent Nonsuicidal Self-Injury

This study examined direct and indirect forms of peer socialization of non-suicidal self-injury (NSSI) in adolescent friendship networks. Data were collected among 348 adolescents (55% females; Mage = 15.02 years; SD = 0.53) at 4 assessment waves. Stochastic actor-based models revealed no evidence for direct socialization of NSSI: adolescents whose friends reported higher NSSI did not increase their NSSI over time. However, indirect forms of socialization were found. After controlling for direct socialization and selection effects, friends' depressive symptoms predicted changes in male and female adolescents' NSSI and friends' impulsivity predicted changes in male adolescents' NSSI. Findings highlight the importance of extending peer influence research beyond the classical "modeling" paradigm by providing evidence that peers may indirectly socialize adolescents' NSSI.

The process of cognitive behaviour therapy for chronic fatigue syndrome: which changes in perpetuating cognitions and behaviour are related to a reduction in fatigue?

OBJECTIVE

Cognitive behaviour therapy (CBT) can significantly reduce fatigue in chronic fatigue syndrome (CFS), but little is known about the process of change taking place during CBT. Based on a recent treatment model (Wiborg et al. J Psych Res 2012), we examined how (changes in) cognitions and behaviour are related to the decrease in fatigue.

METHODS

We included 183 patients meeting the US Centers for Disease Control criteria for CFS, aged 18 to 65 years, starting CBT. We measured fatigue and possible process variables before treatment; after 6, 12 and 18 weeks; and after treatment. Possible process variables were sense of control over fatigue, focusing on symptoms, self-reported physical functioning, perceived physical activity and objective (actigraphic) physical activity. We built multiple regression models, explaining levels of fatigue during therapy by (changes in) proposed process variables.

RESULTS

We observed large individual variation in the patterns of change in fatigue and process variables during CBT for CFS. Increases in the sense of control over fatigue, perceived activity and self-reported physical functioning, and decreases in focusing on symptoms explained 20 to 46% of the variance in fatigue. An increase in objective activity was not a process variable.

CONCLUSION

A change in cognitive factors seems to be related to the decrease in fatigue during CBT for CFS. The pattern of change varies considerably between patients, but changes in process variables and fatigue occur mostly in the same period.

Gender composition of preadolescents' friendship groups moderates peer socialization of body change behaviors

OBJECTIVE

Peer socialization may be an important contributor to the rising prevalence of diet and muscle gain behaviors (i.e., body change behaviors) in adolescence. The present study longitudinally examined body change behaviors in preadolescents' friendship groups as predictors of preadolescents' own body change behaviors. It was predicted that peer socialization effects would vary according to the gender composition of preadolescents' friendship group.

METHOD

Participants (N = 648, 48.8% female) were in grades 6 through 8 at Time 1 and reported their dieting and muscle-gaining behavior at three time points approximately 1 year apart. Friendship groups were identified from preadolescents' friendship nominations. Body mass index and pubertal timing were included in analyses as control variables. A multiple group latent growth curve model was used to examine hypotheses.

RESULTS

Socialization of body change behaviors in preadolescent friendship groups was observed only under certain conditions. For members of all-male friendship groups, preadolescents' dieting trajectories were predicted from friends' average level of dieting.

CONCLUSION

Peer socialization effects are associated with trajectories of preadolescents' body change behaviors, particularly among all-male groups. Future research would benefit from incorporating the friendship group context into the study of health risk behaviors in preadolescents.

Can parental monitoring and peer management reduce the selection or influence of delinquent peers? Testing the question using a dynamic social network approach

We tested whether parents can reduce affiliation with delinquent peers through 3 forms of peer management: soliciting information, monitoring rules, and communicating disapproval of peers. We examined whether peer management interrupted 2 peer processes: selection and influence of delinquent peers. Adolescents' feelings of being overcontrolled by parents were examined as an additional moderator of delinquent selection and influence. Using network data from a community sample (N = 1,730), we tested whether selection and influence processes varied across early, middle, and late adolescent cohorts. Selection and influence of delinquent peers were evident in all 3 cohorts and did not differ in strength. Parental monitoring rules reduced the selection of delinquent peers in the oldest cohort. A similar effect was found in the early adolescent cohort, but only for adolescents who did not feel overcontrolled by parents. Monitoring rules increased the likelihood of selecting a delinquent friend among those who felt overcontrolled. The effectiveness of communicating disapproval was also mixed: in the middle adolescent network, communicating disapproval increased the likelihood of an adolescent selecting a delinquent friend. Among late adolescents, high levels of communicating disapproval were effective, reducing the influence of delinquent peers for adolescents reporting higher rates of delinquency. For those who reported lower levels of delinquency, high levels of communicating disapproval increased the influence of delinquent peers. The results of this study suggest that the effectiveness of monitoring and peer management depend on the type of behavior, the timing of its use, and whether adolescents feel overcontrolled by parents.

Divergence in self- and peer-reported victimization and its association to concurrent and prospective adjustment

Previous studies on victimization have either used self-reports of peer-reports, but correspondence between these measures is low, implying that types of victims may exist that differ in convergence between self- and peer-reported victimization. Importantly, the very few studies that do exist on such types were cross-sectional, and did not address the stability nor predictive validity in terms of adjustment of these types. Using a person-centered approach, the present study identified types of victims that were either convergent or divergent in self- and peer-reported victimization, and examined how these types differed in concurrent and prospective adjustment. Participants were 1,346 adolescents (50 % girls, mean age 14.2) who were followed for 1 year. Using Latent Profile Analysis, we identified two convergent types (self-peer identified victims and non-victims) and two divergent types (self-identified and peer-identified) of victims. The types were highly stable over time. Self-peer identified victims were not only concurrently but also prospectively the least well adjusted. Self-identified victims showed lower levels of emotional adjustment but did not show problems on social adjustment. On the other hand, peer-identified victims were at risk for social but not emotional maladjustment. The findings corroborate previous studies that suggest that self-reported victimization is related to emotional problems, while peer-reported victimization is more indicative of social problems. The findings also suggest that using self-reports or peer-reports only may lead to incomplete conclusions about victims' adjustment on different domains.

Friendship context matters: examining the domain specificity of alcohol and depression socialization among adolescents

Driven by existing socialization theories, this study describes specific friendship contexts in which peer influence of alcohol misuse and depressive symptoms occurs. In the fall and spring of the school year, surveys were administered to 704 Italian adolescents (53 % male, M (age) = 15.53) enrolled in Grades 9, 10 and 11. Different friendship contexts were distinguished based on two dimensions referring to the level (i.e., best friendships and friendship networks) and reciprocity (i.e., unilateral and reciprocal) of the relationships. Social network and dyadic analyses were applied in a complementary manner to estimate peer socialization effects across the different friendship contexts. Results showed that within friendship networks both male and female adolescents' alcohol misuse was affected by friends' alcohol misuse, regardless of whether the relationship was reciprocated or not. Conversely, peer socialization of depressive symptoms only emerged within very best friendship dyads of female adolescents. Findings suggest that the effects of peer socialization depend on the friendship context and specific types of behaviors. The theoretical and methodological implications of the findings are discussed.

The moderating effect of alcohol-specific parental rule-setting on the relation between the dopamine D2 receptor gene (DRD2), the μ-opioid receptor gene (OPRM1) and alcohol use in young adolescents

AIMS

The main aim of the study was to test the moderating effect of two genetic polymorphisms, one in the dopamine D2 receptor gene (DRD2) and one in the mu-opioid receptor gene (OPRM1), on the link between parental rule-setting and adolescent alcohol use.

METHODS

A total of 214 adolescents (M(age )=13.7, 44.9% male) provided saliva samples and completed survey items describing alcohol use and parental rule-setting.

RESULTS

Findings indicated that alcohol-specific parental rule-setting was more robustly associated with alcohol use for adolescents with the DRD2 A1 risk allele and for those with the OPRM1 G-allele.

CONCLUSION

This study replicates the interaction between parental rule-setting and the DRD2 risk allele on adolescent alcohol use and extends the literature by demonstrating the moderating effects of the OPRM1 risk allele on the link between parental rule-setting and adolescent alcohol use.

Parental alcohol-specific rules and alcohol use from early adolescence to young adulthood

BACKGROUND

  Several studies stress the importance of alcohol-specific rules during adolescence to prevent them from drinking early and heavily. However, most studies have short follow-up periods and do not cover the relevant developmental period in which direct parental control diminishes and adolescent alcohol use increases. The current study aimed to provide a developmental perspective on the link between alcohol-specific rules and alcohol use from early adolescence until early adulthood in the Netherlands.

METHODS

  The sample consisted of 428 Dutch families including fathers, mothers and adolescents from 2 age groups (13 and 15 years old) at Time 1 (T1), who have been surveyed annually for 6 years. To address the effect of alcohol-specific rules on adolescent alcohol use over time, a latent growth curve analytic approach with time-varying covariates was employed.

RESULTS

  Over time, adolescent alcohol use increased, whereas alcohol-specific rules decreased. Most importantly, however, the lagged paths of alcohol-specific rules consistently predicted subsequent alcohol use across the 6 assessments for both younger and older siblings. Thus, strict alcohol-specific rules at a certain point in time were related to a lower intensity of adolescent alcohol use a year later.

CONCLUSIONS

  Although parents turn somewhat less strict in alcohol-specific rules over time, and adolescent alcohol use increases over time, the specific rules parents set remain important in restraining the alcohol use of their adolescent offspring. Thus, parents should and can feel confident about their parenting capabilities, and they should maintain being strict to prevent their offspring from drinking.

Alcohol use and friendship dynamics: selection and socialization in early-, middle-, and late-adolescent peer networks

OBJECTIVE

This study examined developmental trends of peer selection and socialization related to friends' alcohol use in early-, middle-, and late-adolescent peer networks, with the primary goal of identifying when these mechanisms emerge, when these mechanisms exert their strongest effects, and when (or if) they decrease in importance. Gender and reciprocity are also tested as moderators of selection and socialization.

METHOD

Cross-sequential study (three age cohorts assessed at three annual measurements) of 950 youth (53% male) initially attending classrooms in Grade 4 (n = 314; M = 10.1 years), Grade 7 (n = 335; M = 13.1 years), and Grade 10 (n = 301; M = 16.2 years).

RESULTS

Similarity between friends' drinking behaviors emerged in Grade 6, peaked in Grade 8, and decreased throughout late adolescence. Adolescents in all three age groups selected peers with similar drinking behaviors, with effects being more robust for early-adolescent males and for late-adolescent females. Peers' alcohol use emerged as a significant predictor of middle-adolescent alcohol use and remained a significant predictor of individual drinking behaviors throughout late adolescence. Socialization did not differ as a function of gender or reciprocity.

CONCLUSIONS

Alcohol-related peer selection was relatively more important than socialization in early-adolescent friendship networks; both mechanisms contributed to explaining similarity between the drinking behaviors of friends in middle and late adolescence. Effects of peer socialization emerged in middle adolescence and remained throughout late adolescence.

Peer selection and influence of delinquent behavior of immigrant and nonimmigrant youths: Does context matter?

This study examines selection and influence related to delinquent behaviors of immigrant and nonimmigrant adolescents attending three majority-immigrant schools (54% to 65.2% immigrant) and four minority-immigrant schools (11.1% to 25.1% immigrant) in one community. The sample included 1,169 youths (50.4% male; 24.2% immigrant) initially between the ages of 12 and 16 years ( M =13.92, SD = 0.85). Results showed that immigrant and nonimmigrant adolescents were similar to their peers on delinquent behaviors, and peer selection and social influence operated in a complementary manner to explain this similarity. The processes did not differ between immigrants and nonimmigrants or between school contexts, suggesting that immigrants do not differ from nonimmigrants on either the prevalence or the processes behind delinquency.