Organized Sport Activities of 11 to 15-Year-Old Adolescents: Trends from 2010-2018 and Socioeconomic Context.

The aim of this paper was to analyse the trends in the participation of Czech adolescents in organized sport activities in relation to the socioeconomic status (SES) of their families. The sample consisted of 11, 13 and 15-year-old children (N = 4425 (2010), 10,361 (2014) and 13,377 (2018)); the data were collected as part of the HBSC Study in the Czech Republic. The findings suggest that adolescents from affluent families tend to participate more often in organized sports-both team activities and individual activities. Fifteen-year-old adolescents from families with a high SES are 3.01 times more likely to participate in individual organized sports than adolescents from low-SES families. The gap between participation in sport activities increases with the children's age but does not change significantly during the observed period. The findings suggest that public health policy should be oriented towards children from less-affluent families.

Test-retest reliability of selected HBSC items in Vietnam: well-being, physical and sedentary activities, and eating behaviours.

BACKGROUND: Valid and reliable research tools to assess children's and adolescent's health-related behaviour are highly needed across the globe. Rapid economic development, globalization, and associated lifestyle challenges observed in most countries support the need for high-quality evidence in adolescents to target health-promoting policies and interventions. This study aims to examine the test-retest reliability of selected well-being, physical and screen-time related siting activities, and eating behaviour items of the Health Behaviour in School-Aged Children (HBSC) questionnaire in a sample of Vietnamese adolescents. METHODS: Data were collected in autumn 2018 in Vietnam (3-week interval). The sample consisted of 410 adolescents (41.0% of boys; mean age = 12.61; SD = 1.24).Test-retest reliability was evaluated using the single measure Intraclass Correlation Coefficients (ICC) and Cohen's kappa statistic stratified by sex, grade and place of residence (urban or rural). RESULTS: The reliability analyses of the well-being items were poor to good ICC values (0.43-0.79) and moderate to large Cohen's kappa values (0.33-0.77). The physical activity and eating behaviour items were moderate (ICC = 0.54-0.65; Cohen's kappa = 0.38-0.57). The screen-time related siting activities items were moderate to large (ICC = 0.51-0.72; Cohen's kappa = 0.42-0.53). There was more item stability among females than males. The social media item was not as stable for 6th graders (ICC = 0.45) compared with older adolescents (ICC 0.68-0.77). CONCLUSIONS: The findings show that with regards to age, sex and place of residence, self-reported health, life satisfaction, physical and screen-time related siting activities, as well as eating behaviour items of the HBSC questionnaire have a sufficient test-retest reliability to be used in national self-report surveys for Vietnamese adolescents while health complaints items showed borderline reliability.