OBJECTIVES: We aimed to assess the associations of involvement in selected unstructured activities (UA) with health-risk behaviours and academic achievement and the degree to which the participation in organized leisure-time activities (OLTA) changes these associations. METHODS: Using a sample of 6935 Czech adolescents aged 13 and 15 years, we investigated adolescents' weekly involvement in hanging out, visiting shopping malls for fun and meeting friends after 8 p.m., OLTA and engagement in three health-risk behaviours and academic achievement. RESULTS: Weekly involvement in the selected UA was associated with higher odds for regular smoking, being drunk, having early sexual intercourse and low academic achievement. Concurrent participation in OLTA did not buffer these negative outcomes, except for sexual experience. However, those highly engaged only in UA were more likely to participate in the health-risk behaviours and report worse academic achievement than those participating in any OLTA concurrently. CONCLUSIONS: The selected UA are strongly associated with an increased occurrence of adolescents' health-risk behaviours and low academic achievement. Concurrent participation in OLTA does not buffer these negative outcomes significantly, but adolescents engaged only in UA consistently report the least favourable outcomes.

Department of Community and Occupational Medicine University Medical Center Groningen University of Groningen Groningen The Netherlands

Department of Health Psychology Faculty of Medicine Safarik University Kosice Slovakia

Department of Social Medicine and Public Health Faculty of Medicine and Dentistry Palacký University Olomouc Czech Republic

Graduate School Kosice Institute for Society and Health Safarik University Kosice Slovakia

Institute of Active Lifestyle Faculty of Physical Culture Palacký University Tr Miru 117 771 11 Olomouc Czech Republic

Olomouc University for Society and Health Institute Palacký University Olomouc Czech Republic

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