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The present study aimed to identify overall stress and salient stressors experienced by adolescents from different education tracks and self-perceived ethnic backgrounds. A total of 1489 adolescents (M = 13.40 years; SD = 0.89 years) from nine Dutch secondary schools participated. Self-reported stressors were measured with the adapted version of the Adolescent Stress Questionnaire - Short. After controlling for age, gender, country of birth, and school classes, results showed that overall stress did not differ for educational track nor for ethnic background subgroups. Adolescents in academic education reported more stress from school-related stressors than adolescents attending vocational education. Adolescents with a mixed ethnic background (i.e., Dutch and another ethnicity) reported more stress regarding school-related stressors than adolescents with a Dutch ethnic background. These differences between adolescents of different educational tracks and ethnic backgrounds have implications for intervention programs targeting specific stressors.

Targeted school-based programs seem to be a promising approach to help adolescents in need. Nevertheless, successful implementation and evaluation of such programs is challenging. However, there is limited knowledge about (overcoming) the challenges of implementation and experimental evaluation of school-based programs. The goal of the present paper is, therefore, to improve future research by describing the challenges encountered and lessons learned during two randomized controlled trials (RCTs) to study the effectiveness of two skills-training programs reducing school or social stress. In this way, we aim to inform others who plan to implement and evaluate such programs in schools using an RCT design. Some of the challenges encountered apply to all effectiveness studies, such as the recruitment and retention of participants; others are more “intervention at school” specific, such as scheduling the programs and assessments. Our experiences show that it is possible to effectively implement and evaluate targeted programs promoting adolescent mental health in secondary schools with RCTs, even during a worldwide health pandemic, but that it requires investing sufficient time in keeping close and regular contact as well as clear communication between the involved parties. Moreover, high levels of flexibility are needed in adjusting scheduled meetings for intervention and research while keeping track of the entire process for each school and individual participant.

Chronic stress is associated with dysregulations in the physiological stress system, resulting in diverse negative developmental outcomes. Since adolescence is a period characterized by increased stress-sensitivity, and schools are an important environment for the developing adolescent, school-based interventions promoting psychosocial functioning are of particular interest to prevent adverse outcomes. The present study therefore aimed to investigate the effectiveness of such interventions on hypothalamic pituitary adrenal-axis (i.e., cortisol) and cardiovascular (i.e., blood pressure [BP] and heart rate [HR]/heart rate variability [HRV]) parameters of stress in adolescents, and examined moderators of effectiveness. The search resulted in the inclusion of k = 9 studies for cortisol, k = 16 studies for BP, and k = 20 studies for HR/HRV. The results indicated a significant small overall effect on reducing BP, but no significant effect for HR/HRV. For cortisol, large methodological variation in the few primary studies did not allow for quantitative analyses, but a qualitative review demonstrated inconsistent results. For BP and HR/HRV, larger effects were observed for intervention programs with a mindfulness and/or meditation component, for interventions without a cognitive-behavioural component and for interventions with a higher intensity. Providing adolescents with techniques to improve indicators of physiological stress may prevent emerging mental health problems.

Increased levels of psychological stress during adolescence have been associated with a decline in academic performance, school dropout and increased risk of mental health problems. Intervening during this developmental period may prevent these problems. The school environment seems particularly suitable for interventions and over the past decade, various school-based stress reduction programs have been developed. The present study aims to evaluate the results of (quasi-)experimental studies on the effectiveness of school-based intervention programs targeting adolescent psychological stress and to investigate moderators of effectiveness. A three-level random effects meta-analytic model was conducted. The search resulted in the inclusion of k = 54 studies, reporting on analyses in 61 independent samples, yielding 123 effect sizes (N = 16,475 individuals). The results indicated a moderate overall effect on psychological stress. Yet, significant effects were only found in selected student samples. School-based intervention programs targeting selected adolescents have the potential to reduce psychological stress. Recommendations for practice, policy and future research are discussed.