Tom Frijns

Developmental links of adolescent disclosure, parental solicitation, and control with delinquency: moderation by parental support.

This 4-wave study among 309 Dutch adolescents and their parents examined changes in adolescent disclosure, parental solicitation, and parental control and their links with the development of delinquent activities. Annually, adolescents and both parents reported on adolescent disclosure, parental solicitation, and parental control, and adolescents reported on delinquent activities and parental support. Latent growth curve analyses revealed a linear decline in parental control between ages 13 and 16. Adolescent disclosure decreased gradually in adolescent reports and showed an L-shaped pattern in father reports and a V-shaped pattern in mother reports. A stronger increase in delinquent activities was related to a stronger decrease in disclosure in mother and adolescent reports and to lower levels of disclosure in father reports. The linkages between levels of disclosure and delinquent activities were stronger in families with high parental support than in families with lower support. Furthermore, in lower parental support families, a stronger decrease in paternal control was related to a stronger increase in delinquent activities. In high parental support families, however, a stronger decrease in adolescent-reported parental control was related to a less strong increase in delinquent activities.

Longitudinal Associations between Perceived Parent-Child Relationship Quality and Depressive Symptoms in Adolescence.

This longitudinal study examined bidirectional paths between perceived parent-adolescent relationship quality and depressive symptoms, as well as the moderating role of sex, age, and personality type. 1313 Dutch adolescents (51% girls) from two cohorts (923 12-year olds and 390 16-year olds at Wave 1) reported on their personality, depressive symptoms, and perceived relationship quality to parents in four waves. Consistent with a relationship erosion perspective, depressive symptoms negatively predicted perceived relationship quality with parents. Relationship quality to mothers predicted depressive symptoms for boys and girls, but relationship quality to fathers predicted depressive symptoms only for boys. Personality type only moderated initial associations between relationship quality with mothers and depressive symptoms, which were stronger for Overcontrollers and Undercontrollers than for Resilients. Results thus reveal a pattern of mutual influence between perceived relationship quality and depressive symptoms that is moderated by the interplay among parent and adolescent sex and adolescent personality type.

What parents don't know and how it may affect their children: qualifying the disclosure-adjustment link.

Recent research has identified adolescent disclosure to parents as a powerful predictor of adolescent adjustment. We propose, however, that the common operationalization of adolescent disclosure incorporates the two separate constructs of disclosure and secrecy, and predicted that the disclosure-adjustment link can largely be explained by the unique contribution of secrecy from parents. A four-wave survey study among 309 adolescents tested these predictions. Factor analyses confirmed that disclosure and secrecy should be distinguished as two separate constructs. Moreover, in cross-lagged path analyses, only secrecy was a longitudinal predictor of adolescent internalizing (i.e., depression) and externalizing (i.e., delinquency) problems, disclosure was not. Secrecy consistently contributed to the longitudinal prediction of delinquency from early to middle adolescence, whereas it contributed to the prediction of depression only in early adolescence. Findings thus attest the importance of distinguishing between disclosure and secrecy and suggest that the disclosure-adjustment link may actually reflect a secrecy-maladjustment link.

Daily Dynamics of Personal Identity and Self-concept Clarity

We examined the daily dynamics among self–concept clarity and identity processes, and their effects on distress, among a sample of 580 Dutch adolescents. Participants completed measures of identity, self–concept clarity, anxiety and depression at annual intervals; and daily single–item measures of self–concept clarity, identity commitments and reconsideration across three 5–day weeks. We examined (a) cross–lagged associations of self–concept clarity to identity commitment and reconsideration and (b) associations of daily fluctuations in self and identity processes to later anxiety and depression. Results indicated that self–concept clarity and identity commitments influence one another reciprocally across days, and that day–to–day fluctuations in identity predicted later anxiety and depression. Results are discussed in terms of self and identity processes and their effects on distress. Copyright

Short-term fluctuations in identity: introducing a micro-level approach to identity formation

The present study was aimed at examining one relatively neglected part of the identity formation process: the short-term dynamics of identity formation. The short-term dynamics were assessed by examining (a) the day-to-day course of 2 key dimensions of identity formation (i.e., commitment and reconsideration) and (b) the impact of fluctuations in commitment and reconsideration on subsequent levels of these 2 dimensions. Longitudinal data on 580 early adolescents (54.8% boys, 45.2% girls) were used to test these assertions. The authors found evidence for a commitment-reconsideration dynamic that operated on a day-to-day basis. Furthermore, the findings confirmed E. H. Eriksons (1950) assertion that identity reflects a sense of sameness and continuity as a more stable identity (reflected by little day-to-day fluctuations) was predictive of higher levels of commitment and lower levels of reconsideration. Taken together, the present study underscores the importance of the short-term dynamics of identity formation.

Come rain or come shine: individual differences in how weather affects mood

There is a widespread belief that weather affects mood. However, few studies have investigated this link, and even less is known about individual differences in peoples responses to the weather. In the current study, we sought to identify weather reactivity types by linking self-reported daily mood across 30 days with objective weather data. We identified four distinct types among 497 adolescents and replicated these types among their mothers. The types were labeled Summer Lovers (better mood with warmer and sunnier weather), Unaffected (weak associations between weather and mood), Summer Haters (worse mood with warmer and sunnier weather), and Rain Haters (particularly bad mood on rainy days). In addition, intergenerational concordance effects were found for two of these types, suggesting that weather reactivity may run in the family. Overall, the large individual differences in how peoples moods were affected by weather reconciles the discrepancy between the generally held beliefs that weather has a substantive effect on mood and findings from previous research indicating that effects of weather on mood are limited or absent.

Heterogeneity in development of adolescent anxiety disorder symptoms in an 8-year longitudinal community study.

In this study, we prospectively examined developmental trajectories of five anxiety disorder symptom dimensions (generalized anxiety disorder, panic disorder, school anxiety, separation anxiety disorder, and social anxiety disorder) from early to late adolescence in a community sample of 239 adolescents, assessed annually over 8 years. Latent growth modeling indicated different developmental trajectories from early into late adolescence for the different anxiety disorder symptoms, with some symptoms decreasing and other symptoms increasing over time. Sex differences in developmental trajectories were found for some symptoms, but not all. Furthermore, latent class growth analysis identified a normal developmental profile (including a majority of adolescents reporting persistent low anxiety disorder symptoms over 8 years) and an at-risk developmental profile (including a minority of adolescents reporting persistent high anxiety disorder symptoms over 8 years) for all of the anxiety disorder symptom dimensions except panic disorder. Additional analyses longitudinally supported the validity of these normal and at-risk developmental profiles and suggested differential associations between different anxiety disorder symptom dimensions and developmental trajectories of substance use, parenting, and identity development. Taken together, our results emphasize the importance of examining separate dimensions of anxiety disorder symptoms in contrast to a using a global, one-dimensional approach to anxiety.

Long-term stability of the cortisol awakening response over adolescence

The cortisol awakening response (CAR) has been widely assessed as a measure of hypothalamic-pituitary-adrenal (HPA) axis activity. Short-term stability is high; however, little is known about the long-term stability of the CAR. Because there are indications that development in adolescence influences HPA axis activity, this study investigated the stability of the CAR over adolescence. Participants were 229 boys and 181 girls from an adolescent general population sample who were assessed in three consecutive years, at mean ages of 15.0 (SD=0.4), 16.0 (SD=0.4) and 17.0 (SD=0.4) years. Cortisol was analyzed in saliva sampled at awakening, and 30 and 60min later. Stability was investigated both as rank-order and as mean-level stability. Effects of physical development during adolescence on stability were investigated as well. Rank-order stability was moderate to low, with tracking coefficients (interpretable as stability coefficients over time) of .15 (p<.001) for cortisol at awakening and .24 (p<.001) for cortisol 30 and 60min after awakening. Mean-levels of cortisol at awakening did not change, while the response to awakening increased over the years (linear slopes for cortisol 30 and 60min after awakening all p<.01). The increase may reflect the physical development of the adolescents. This is the first study, in a large population based sample, indicating that the rank-order of the CAR is stable over the course of several years. Interestingly, mean-levels of the cortisol response to awakening increased over the years, suggesting a maturation of HPA axis reactivity in relation to physical development over adolescence. Physical development should therefore be taken into account when investigating the CAR as a measure of HPA axis activity in adolescence.

Siblings versus Parents and Friends: Longitudinal Linkages to Adolescent Externalizing Problems.

Background: It is well documented that friends’ externalizing problems and negative parent–child interactions predict externalizing problems in adolescence, but relatively little is known about the role of siblings. This four-wave, multi-informant study investigated linkages of siblings’ externalizing problems and sibling–adolescent negative interactions on adolescents’ externalizing problems, while examining and controlling for similar linkages with friends and parents. Methods: Questionnaire data on externalizing problems and negative interactions were annually collected from 497 Dutch adolescents (M = 13.03 years, SD = 0.52, at baseline), as well as their siblings, mothers, fathers, and friends. Results: Cross-lagged panel analyses revealed modest unique longitudinal paths from sibling externalizing problems to adolescent externalizing problems, for male and female adolescents, and for same-sex and mixed-sex sibling dyads, but only from older to younger siblings. Moreover, these paths were above and beyond significant paths from mother–adolescent negative interaction and friend externalizing problems to adolescent externalizing problems, 1 year later. No cross-lagged paths existed between sibling–adolescent negative interaction and adolescent externalizing problems. Conclusions: Taken together, it appears that especially older sibling externalizing problems may be a unique social risk factor for adolescent externalizing problems, equal in strength to significant parents’ and friends’ risk factors.

Cannabis market : user types, availability and consumption estimates

In this report we will start with a brief overview of recent developments relating to cannabis markets and policies in the seven countries participating in the project (chapter 1). Most of the information in this chapter is based on the National Reports of the EU Member States to the EMCDDA and can be found on the EMCDDA website (www.emcdda.europa.eu). One document is of special interest in this regard: the recently published Insight of the EMCDDA making a detailed account of the cannabis markets (Carpentier et al. 2012), which is partly based on the Reitox National reports for 2009. For Portugal and The Netherlands specific case studies of drug policy and cannabis policy, respectively, are described in Part III, report 1 and 2. We will then summarize the latest figures on cannabis use and trends in cannabis use (chapter 2). In chapter 3 an introduction is given into ways to classify or typology cannabis users and how we have defined different user groups in the present study. The remainder of this chapter and the next chapter (chapter 4) describe the findings of the web survey conducted in the seven countries with regard to characteristics of cannabis users, especially their consumption patterns, and the availability of cannabis to different user groups. In the last chapter (chapter 5) an integration will be made of existing data on the prevalence of cannabis use and web survey data on consumption patterns in order to estimate per user group the total amount of cannabis consumed annually in each country.To explore the European drug market from the demand side, we conducted web surveys in seven selected EU Member States (Bulgaria, Czech Republic, Italy, Netherlands, Portugal, Sweden and the United Kingdom) among last year users of (meth) amphetamine, ecstasy and cocaine. These users provided us with information on quantitative and qualitative aspects of their drug use such as their frequency of use and usual locations of purchase and use, thus offering us a window on patterns of drug use and availability. On the basis of past year use frequency, we divided users of each drug into three user type groups of infrequent (less than 11 use days), occasional (11-50 use days) and frequent (51-365 use days) users. We present findings per Member State as a whole and, wherever sample size allows, separately per user type. Our typology shows that infrequent users comprise the largest group for each drug and that the amount consumed on a typical use day increases with increasing frequency of use. We also estimated total annual consumption of (meth)amphetamine in the Czech Republic, the Netherlands and Sweden, and of ecstasy and cocaine in the Netherlands on the basis of the user type distinction. To this end, we calculated mean individual annual consumption within each user type group and combined these figures with absolute numbers of users of each type derived from general and targeted population survey data to arrive at estimates of total annual consumption. Individual annual consumption was higher among occasional than infrequent users and was highest among frequent users. In terms of total annual consumption, the smallest group of frequent users is responsible for the largest part of the total estimated amounts of each drug consumed. We discuss and compare our estimates to those from previous drug market research.In this report we explore some aspects of heroin consumption, using the data we collected through the face-to-face interviews and comparing our findings with data from other research and monitoring sources. We focus on Italy, the Netherlands and England, the three sample Member States where we have the most robust data from our face-to-face interviews. We worked with purposive samples to gain insights into the demand side of the drugs market. Occasional, non-dependent heroin use proves to be rather rare. We therefore do not differentiate between user types but focus only on regular or PHUs. The main issues of concern in our questionnaires were using and buying behaviours i.e. where drug users buy, what considerations play a role in their behaviour, etc.