Cross-National Study on the Convergent, Discriminant, and Concurrent Validity of the "Body Size Perception" Item in the Health Behaviour in School-aged Children Survey.

Background: Despite its significant usefulness in adolescent health studies, the single-item "body size perception" question, developed within the Health Behaviour in School-aged Children (HBSC) survey, has yet to undergo multidimensional validation.

Objectives: To assess the convergent, divergent and concurrent validity of the HBSC body size perception question among adolescents.

Methods: The single-item HBSC body size perception question is as follows: "Do you think your body is…?," with answers ranging from "much too thin" to "much too fat.

Weekday sleep duration and morning tiredness are independent covariates of breakfast skipping in adolescents.

Background/objectives: Although regular breakfast consumption is associated with various health benefits, many adolescents skip this meal, particularly those with shorter sleep durations. In order to better understand the association between sleep duration and breakfast consumption among youth, we analyzed the association between weekday morning tiredness and daily breakfast consumption in adolescents, and explored the mediating role of morning tiredness in the association between sleep duration and daily breakfast consumption on weekdays.

Subjects/methods: The "Health Behaviour in School-aged Children" survey conducted in 2018 in French-speaking Belgian schools provided data (n = 8444 11-20-year-old adolescents) on bed- and wake-up times, and on the frequency of breakfast consumption and morning tiredness on weekdays.

Long-term trends in the consumption of sugary and diet soft drinks among adolescents: a cross-national survey in 21 European countries.

Purpose: To assess country-level trends in the prevalence of daily consumption of sugary (2002-2018) and diet (2006-2018) soft drinks among European adolescents, overall and by family material affluence.

Methods: We used 2002, 2006, 2010, 2014 and 2018 data from the 'Health Behaviour in School-aged Children' survey. Nationally representative samples of adolescents completed a standardised questionnaire at school, including a short food frequency questionnaire (n = 530,976 and 21 countries for sugary soft drinks; n = 61,487 and 4 countries for diet soft drinks).

Dietary disparities among adolescents according to individual and school socioeconomic status: a multilevel analysis.

This study aimed to estimate disparities in dietary habits according to the individual and contextual socioeconomic status (SES), while taking into account school nutrition-related characteristics. Data came from the 2018 cross-sectional "Health Behaviour in School-aged Children" (HBSC) survey. Multilevel multiple logistic regressions were performed.

Twenty-Four-Year Trends in Family and Regional Disparities in Fruit, Vegetable and Sugar-Sweetened Beverage Consumption among Adolescents in Belgium.

Dietary habits are influenced by various determinants that may evolve over time. This study aimed to examine, among adolescents in Belgium, trends in the dietary habits between 1990 and 2014 and to determine changes in family and regional disparities related to diet during this time period. In the 1990, 2002 and 2014 cross-sectional "Health Behaviour in School-aged Children" (HBSC) surveys, food consumption was estimated using a short Food Frequency Questionnaire.

Alcohol consumption in early adolescence: Associations with sociodemographic and psychosocial factors according to gender.

Introduction: Early alcohol consumption can irreversible damage the adolescents' brain and may affect their quality of life. In order to better prevent such a deleterious behaviour, knowing its determinants is needed. So far, only few studies among adolescents aged <15 years exist, of which the majority failed to include gender differences.

Habitual food consumption of the Belgian population in 2014-2015 and adherence to food-based dietary guidelines.

Background: Between 2014 and 2015 a second National Food Consumption Survey was conducted in Belgium in order to evaluate the habitual food consumption in the general Belgian population and to compare it with food-based dietary guidelines (FBDG) and results of the 2004 Food Consumption Survey.

Methods: A representative sample of the Belgian population was randomly selected from the National Population Register following a multistage stratified sampling procedure. Information on dietary intake was collected from 3146 subjects between 3 and 64 year old through two non-consecutive 24-hour dietary recalls using GloboDiet®.

Feelings about the timing of first sexual intercourse and health-related quality of life among adolescents.

Background: Early sexual intercourse (SI) may have long-lasting negative impacts on health-related quality of life (HRQoL). So far, these impacts have been studied using age for defining early SI instead of feelings about its timing. The present study examined the association between feelings about the timing of first SI and current HRQoL.

Socioeconomic Disparities in Diet Vary According to Migration Status among Adolescents in Belgium.

Little information concerning social disparities in adolescent dietary habits is currently available, especially regarding migration status. The aim of the present study was to estimate socioeconomic disparities in dietary habits of school adolescents from different migration backgrounds. In the 2014 cross-sectional "Health Behavior in School-Aged Children" survey in Belgium, food consumption was estimated using a self-administrated short food frequency questionnaire.

Environmental correlates of physical activity among children 10 to 13 years old in Wallonia (Belgium).

Background: In Belgium, as in many other countries, the juvenile practice of physical activity is insufficient. A growing attention has been paid to environmental factors that may influence physical activity but with inconsistent findings. This study aims to estimate the association between daily life environment characteristics and physical activity among children 10 to 13 years old in Wallonia (Belgium).

Perceived social support from teachers and classmates does not moderate the inverse association between body mass index and health-related quality of life in adolescents.

Purpose: The current study investigated the association between body mass index (BMI) and health-related quality of life (HRQoL) among a large and non-clinical sample of adolescents, and tested the possible moderating effect of perceived teacher and classmate support on this association.

Methods: French-speaking Belgian adolescents (n = 11,342) self-reported height and weight, HRQoL (KIDSCREEN-10), as well as their perception of teacher and classmate relationships. Adjusting for sociodemographics, linear regression analyses with HRQoL as the outcome variable were performed for boys and girls separately.

Physical activity and sedentary behavior in Belgium (BNFCS2014): design, methods and expected outcomes.

Background: There is strong evidence to indicate that regular moderate intensity physical activity is associated with health benefits. Furthermore, sedentary behavior has been related with an increased risk for all-cause mortality. The accurate measurement of physical activity and sedentary behavior is therefore vital to evaluate their health impact and provide evidence for the development of public health recommendations.

Protocol of the Belgian food consumption survey 2014: objectives, design and methods.

Background: Dietary patterns are one of the major determinants as far as health and burden of disease is concerned. Food consumption data are essential to evaluate and develop nutrition and food safety policies. The last national food consumption survey in Belgium took place in 2004 among the Belgian population aged 15 years and older.