Development and validation of a scale to measure social isolation in adolescents.

There is a lack of questionnaires specifically designed to assess social isolation in adolescents. We developed and validated a self-report measure of social isolation in adolescents, the Social Isolation Questionnaire (QIS). A literature review on social isolation and mental health in adolescents indicated 20 questions to form QIS.

Universal school-based intervention targeting depressive symptoms in adolescents: A cluster randomized trial.

We investigated the effects of three different interventions on depressive symptoms in adolescents. As a secondary aim, we explored the mediating role of social isolation, anxiety, sleep quality, and cognitive function of the intervention effect on depressive symptoms. We conducted a cluster randomized controlled trial, in which schools were randomly assigned to 1.

Violence and psychosocial stress: A 10-year time trend analysis.

Aim: The aim of this study was to analyze the temporal trend of psychosocial stress and its association between exposure to violence in adolescents.

Methods: This is a cross-sectional study of temporal trends based on three school-based and statewide surveys with regular intervals of five years. The target population consisted of high school students from public schools.

Sociodemographic inequalities in leisure-time physical activity and active commuting to school in Brazilian adolescents: National School Health Survey (PeNSE 2009, 2012, and 2015).

The objective of this study was to identify inequalities in leisure-time physical activity and active commuting to school in Brazilian adolescents, as well as trends according to gender, type of school, maternal schooling, and geographic region, from 2009 to 2015. This was a descriptive study based on data from the Brazilian National School Health Survey (PeNSE) in 2009, 2012, and 2015. Students were defined as active in their leisure time when they practiced at least 60 minutes of physical activity a day on five or more of the seven days prior to the interview.

Association between physical activity, participation in Physical Education classes, and social isolation in adolescents.

Objective: To analyze the association between physical activity, participation in Physical Education classes, and indicators of social isolation among adolescents.

Methods: This was an epidemiological study based on secondary analysis of data from a representative sample of students (14-19 years) from public high schools (n=4,207). Data were collected through the questionnaire Global School-based Student Health Survey.