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.

• Keywords
• Adolescent’s, HBSC, Measures, Screen-time, Surveys,
• MeSH
• Adolescent Behavior * MeSH
• Child MeSH
• Humans MeSH
• Adolescent MeSH
• Surveys and Questionnaires MeSH
• Reproducibility of Results MeSH
• Feeding Behavior MeSH
• Health Behavior MeSH
• Check Tag
• Child MeSH
• Humans MeSH
• Adolescent MeSH
• Male MeSH
• Female MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Geographicals
• Vietnam MeSH

The aim of this study was to investigate the test-retest reliability of the motives for undertaking physical activity (PA) items from the Health Behavior in School-Aged Children (HBSC) study questionnaire among Slovak and Czech adolescents and to determine whether this reliability differs by gender, age group and country. We obtained data from 580 students aged 11 and 15 years old (51.2% boys) who participated in a test and retest study with a four-week interval in 2013 via the Health Behavior in School-Aged Children cross-sectional study in the Czech Republic and Slovakia. We estimated the test-retest reliability of all 13 dichotomized motives by using Intraclass Correlation Coefficients (ICC) and Cohen's Kappa statistics, for continuous and dichotomized motives, respectively. Test-retest reliability showed moderate agreement for nine motives (ICC from 0.41 to 0.60) and fair agreement for four motives (ICC from 0.33 to 0.40). Kappa statistics were similarly moderate to large (0.33 to 0.61), except for three motives with small or trivial correlations. The motives "To improve my health" and "To enjoy the feeling of using my body" had consistently low Kappas and correlations. Overall, the results of this study suggest that most questions on motives for PA on the HBSC questionnaire have acceptable test-retest characteristics for use among adolescents.

• Keywords
• Health Behavior in School-Aged Children (HBSC) study, active living, adolescence, gender, health-related behavior, motivation,
• MeSH
• Exercise * MeSH
• Child MeSH
• Humans MeSH
• Adolescent MeSH
• Cross-Sectional Studies MeSH
• Surveys and Questionnaires standards   MeSH
• Psychometrics MeSH
• Reproducibility of Results MeSH
• Check Tag
• Child MeSH
• Humans MeSH
• Adolescent MeSH
• Male MeSH
• Female MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Geographicals
• Czech Republic MeSH
• Slovakia MeSH