Background: Previous studies in adolescents have rarely used validated questionnaires to assess stress and psychiatric symptoms.

Psychiatric symptoms and stress are on the increase among Swedish adolescents. We aimed to study the potential effect and feasibility of two Internet-based self-help programmes, one mindfulness based (iMBI) and the other music based in a randomised controlled trial that targeted adolescents. A total of 283 upper secondary school students in two Swedish schools were randomised to either a waiting list or one of the two programmes, on their own incentive, on schooltime. General psychiatric health (Symptoms Checklist 90), sleep quality (Pittsburgh Sleep Quality Index), and perceived stress (Perceived Stress Scale) were assessed before and after the interventions. In total, 202 participants answered the questionnaires. Less than 20 logged into each intervention and only 1 performed a full intervention (iMBI). No significant differences in any of the scales were found between those who logged in and those who did not. The potential effect of Internet-based self-help programmes was not possible to examine due to low compliance rates. Adolescents seem to have a very low compliance with Internet-based self-help programmes if left to their own incentive. There were no associations between the psychiatric and stress-related symptoms at baseline and compliance in any of the intervention groups, and no evidence for differences in compliance in relation to the type of programme. Additional studies are needed to examine how compliance rates can be increased in Internet-based self-help mindfulness programmes in adolescents, as the potentially positive effects of mindfulness are partly related to compliance rates.Electronic supplementary materialThe online version of this article (doi:10.1007/s00787-017-1035-6) contains supplementary material, which is available to authorized users.

Aims: Psychiatric symptoms, sleeping problems and stress are increasing in Swedish adolescents. The aim of this study was to test the hypothesis that a combination of two potential stressors (i.e., high academic proficiency and high urbanicity) in a school setting would be related to increased stress levels and stress-related symptoms among pupils. Our second aim was to evaluate correlations between perceived stress and psychiatric symptoms, sleep quality and personality traits. Methods: 202 Swedish high-school students from two schools, one with high academic proficiency in the Metropolitan Malmö area and one of average academic proficiency in a medium-sized town, participated. We used Internet-based versions of the following questionnaires: Symptoms Checklist 90 (SCL-90) for general psychiatric symptoms, Perceived Stress Scale (PSS-14) for stress, Pittsburgh Sleep Quality Index (PSQI) for sleep quality and Eysenck Personality Index (EPI) for personality traits. Results: There was no significant difference between the schools in any of the measured scales. Significant correlations between perceived stress and GSI score, PSQI score and the personality trait Neuroticism were observed. Conclusions: This study suggests no difference between the high academic proficiency/metropolitan school and the average academic proficiency/medium-sized town school in perceived stress levels or stress-related psychiatric symptoms.

Background: Sleep affects psychiatric health and perceived stress during adolescence. Objective: The first aim of this study was to investigate the prevalence of poor sleep in a sample of Swedish adolescents aged 15 to 19 years. The second aim was to investigate correlations between: a) sleep and psychiatric symptoms and; b) sleep and perceived stress. The third aim was to examine possible sex differences in sleep. Method: In 2011, a total of 185 Swedish adolescents (aged 15 to 19 years) from two upper secondary schools participated in this cross-sectional study. We used three different psychometric scales: Pittsburgh Sleep Quality Index (PSQI), Symptoms Checklist (SCL-90), and Perceived Stress Scale (PSS) to measure sleep, general psychiatric health and perceived stress. Results: In total, 76% of the female students and 71% of the male students had poor overall sleep quality. A large majority, 93%, reported daytime dysfunction and 60% reported problems staying awake during daily activities. The correlation between sleep and general psychiatric health was 0.44 and the correlation between sleep quality and perceived stress was 0.48. Female students reported significantly more sleep disturbances than male students do. Conclusions: Three out of four of the upper secondary school students presented with poor overall sleep that associated with psychiatric symptoms and perceived stress. These findings add to results from earlier studies and imply that interventions to improve sleep in adolescents, individually as well as on a societal level, should be considered as one way of trying to impact the observed rising numbers of psychiatric complaints. Such interventions may improve mental and somatic health in adolescents and prevent the development of psychiatric and stress-related symptoms. Further studies of possible methods, and their implementation, for improving sleep in adolescents should be of high priority.