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Background  Canadian youth exhibit a number of risky behaviours, some of which are associated with overweight and obesity. The purpose of this study was to examine the prevalence of 15 modifiable risk behaviours in a large sample of Canadian youth, to identify underlying subgroups based on patterns of health behaviours, and to examine the association between identified subgroups and overweight/obesity.    Methods  Data from 18,587 grades 9–12 students in Year 1 (2012–13) of the COMPASS study and latent class analysis were used to identify patterns and clustering among 15 health behaviours (e.g., physical inactivity, sedentary behaviour, unhealthy eating, substance use). A logistic regression model examined the associations between these clusters and overweight/obesity status.    Results  Four distinct classes were identified:  traditional school athletes, inactive screenagers, health conscious , and  moderately active substance users . Each behavioural cluster demonstrated a distinct pattern of behaviours, some with a greater number of risk factors than others.  Traditional school athletes  (odds ratio (OR) 1.15, 95% CI 1.03–1.29),  inactive screenagers  (OR 1.33; 1.19–1.48), and  moderately active substance users  (OR 1.27; 1.14–1.43) were all significantly more likely to be overweight/obese compared to the  health conscious  group.    Conclusions  Four distinct subpopulations of youth were identified based on their patterns of health and risk behaviours. The three clusters demonstrating poorer health behaviour were all at an increased risk of being overweight/obese compared to their somewhat healthier peers. Obesity-related public health interventions and health promotion efforts might be more effective if consideration is given to population segments with certain behavioural patterns, targeting subgroups at greatest risk of overweight or obesity.

Clustering of risk-related modifiable behaviours and their association with overweight and obesity among a large sample of youth in the COMPASS study