A randomized controlled trial of a brief motivational enhancement for non-treatment-seeking adolescent cannabis users.

Evidence for negative effects of early-onset cannabis use has led to a need for effective interventions targeting adolescent cannabis users. A randomized controlled trial of an Australian two-session intervention based on motivational interviewing (the ACCU, or Weed-Check in Dutch) was replicated in a larger Dutch sample of 119 non-treatment-seeking adolescent cannabis users. Outcome measures at the 3-month follow-up were quantity and frequency of cannabis use, symptoms of dependence, stage of change, and psychosocial functioning.

Risk moderation of a parent and student preventive alcohol intervention by adolescent and family factors: a cluster randomized trial.

Objective: To examine risk moderation of an alcohol intervention targeting parents and adolescents.

Design: A cluster randomized trial including 2937 Dutch early adolescents (m=12.68years, SD=0.

Mediation and moderation effects of an in-home family intervention: the "in control: no alcohol!" pilot study.

The aim of this study was to examine the effect of a theory-based in-home family intervention (In control: No alcohol!) on adolescent alcohol cognitions via its putative mediators using a randomized controlled design. In the South Holland region of the Netherlands, a total of 213 children (11-12 years) and their mothers were randomly assigned to the prevention program (108 dyads) and the control condition (105 dyads). Mediation effects were analyzed using pretest and two follow-up measurements (5 and 12 months after baseline).

A cluster randomized trial on the effects of a parent and student intervention on alcohol use in adolescents four years after baseline; no evidence of catching-up behavior.

Objective: It is questioned whether the alcohol prevention program "Prevention of Alcohol use in Students" (PAS) is effective in reducing the prevalence of heavy weekend drinking and the amount of drinking among adolescents at the age at which they are allowed to buy alcohol in The Netherlands (16 years). In addition, it is questioned whether the intervention effects are attributed to a delay in onset earlier in adolescence or to the development of skills due to the PAS intervention (mediation analyses).

Design: A cluster randomized trial including 3490 Dutch early adolescents (M age=12.

The influence of paternal and maternal drinking patterns within two-partner families on the initiation and development of adolescent drinking.

As it is still unclear to what extent parental drinking is a predictor of children's alcohol use, we tested the association of specific paternal and maternal drinking patterns with both initiation and development of adolescent alcohol use. Longitudinal data (four annual measurements) of parent-child dyads (N=2319) have been used. Parental drinking patterns have been identified using latent class analysis.

Developmental alcohol-specific parenting profiles in adolescence and their relationships with adolescents' alcohol use.

Previous studies on general parenting have demonstrated the relevance of strict parenting within a supportive social context for a variety of adolescent behaviors, such as alcohol use. Yet, alcohol-specific parenting practices are generally examined as separate predictors of adolescents' drinking behavior. The present study examined different developmental profiles of alcohol-specific parenting (rule-setting, quality and frequency of communication about alcohol use) and how these patterns relate to the initiation and growth of adolescents' drinking.

Differential impact of a Dutch alcohol prevention program targeting adolescents and parents separately and simultaneously: low self-control and lenient parenting at baseline predict effectiveness.

To test whether baseline levels of the factors accountable for the impact of the Prevention of Alcohol use in Students (PAS) intervention (self-control, perceived rules about alcohol and parental attitudes about alcohol), moderate the effect of the intervention. A cluster randomized trial including 3,490 Dutch early adolescents (M age=12.66, SD=.

Results of the 'in control: no alcohol!' pilot study.

More than 50% of Dutch 12-year olds already started drinking. Since it is known that delaying the onset of alcohol use results in a lower risk of alcohol-related problems, the recently developed 'In control: No alcohol!' prevention program is targeted at elementary school children and their mothers. In this pilot study, the success of program implementation and impact of the program on quality of alcohol-specific communication, rules and monitoring were evaluated, using a randomized controlled design.

Effectiveness of the home-based alcohol prevention program "In control: no alcohol!": study protocol of a randomized controlled trial.

Background: In the Netherlands, children start to drink at an early age; of the Dutch 12-year olds, 40% reports lifetime alcohol use, while 9.7% reports last-month drinking. Starting to drink at an early age puts youth at risk of developing several alcohol-related problems later in life.

Why target early adolescents and parents in alcohol prevention? The mediating effects of self-control, rules and attitudes about alcohol use.

Aims: To examine the effects of a parent and student intervention offered separately and simultaneously (PAS) on onset of weekly drinking via its putative mediators.

Design: A randomized trial with four conditions; (1) parent intervention, (2) student intervention, (3) combined parent-student intervention and (4) control group.

Setting: High schools selected randomly, located in different areas.

Preventing heavy alcohol use in adolescents (PAS): cluster randomized trial of a parent and student intervention offered separately and simultaneously.

Aims: To evaluate the effectiveness of two preventive interventions to reduce heavy drinking in first- and second-year high school students.

Design And Setting: Cluster randomized controlled trial using four conditions for comparing two active interventions with a control group from 152 classes of 19 high schools in the Netherlands.

Participants: A total of 3490 first-year high school students (mean 12.

Alcohol-specific socialization practices and alcohol use in Dutch early adolescents.

The present study examined the associations of alcohol-specific socialization practices and heavy parental drinking with alcohol use in early adolescents. Cross-sectional nationwide survey data from 2599 parent-adolescent (mean age=12.16) dyads were used to conduct logistic regression analyses.

Body mass index and body weight perception as risk factors for internalizing and externalizing problem behavior among adolescents.

Purpose: To examine the relationship between body mass index (BMI), body weight perception (BWP), and indicators of internalizing and externalizing distress and social, attention and thought problems in a large representative sample of Dutch youth.

Methods: A total of 1826 pupils in the eighth grade of primary education and 5730 students in the first four years of secondary education gave their height and weight to obtain an estimate of their BMI. They reported their evaluation of their body weight and completed Achenbach's Youth Self-Report (YSR) (1991), which assesses eight types of problem behavior.

Estimating non-response bias in a survey on alcohol consumption: comparison of response waves.

Aims: According to 'the continuum of resistance model' late respondents can be used as a proxy for non-respondents in estimating non-response bias. In the present study, the validity of this model was explored and tested in three surveys on alcohol consumption.

Methods: The three studies collected their data by means of mailed questionnaires on alcohol consumption whereby two studies also performed a non-response follow-up.