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▶ Sociodemographic data
on factors such as sex, age, family structure, migration background, indicators of family social standing (family affluence)
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▶ General health indicators
for example on subjective health and well-being, physical and mental health
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▶ Health and risk behaviour
on factors such as substance use, physical activity, media use, dietary habits, bullying and violence, as well as sexual behaviour (only 15-year-olds)
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▶ Social contexts
for example questions regarding family (i.e. family support), school (class environment, school burdens, support by teachers and students), peers (for example quality of relationships)
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