Associations between Neighbourhood Characteristics, Body Mass Index and Health-Related Behaviours of Adolescents in the Kiel Obesity Prevention Study: A Multilevel Analysis
Résumé
Objective: To understand determinants of overweight, several studies addressed the association between neighbourhood characteristics and adult obesity. However, little is known about the association of such characteristics with adolescents' overweight. This study aims at the influence of neighbourhood characteristics on adolescent BMI and lifestyle and to what extent BMI- and lifestyle variation between neighbourhoods can be explained by neighbourhood characteristics. Subjects / Methods: We used cross-sectional data from the Kiel Obesity Prevention Study collected between 2004-2008 in 28 different residential districts of the city of Kiel (North Germany). Anthropometric data were available for 1675 boys and 1765 girls (n=3440) aged 13 to 15 years, and individual lifestyle factors and socio-demographic data were included in the analysis. At the macro-level, six different neighbourhood characteristics were used: unemployment rate, population density, traffic density, prevalence of energy-dense food supply, number of sports fields and parks, and crime rate. To test our main hypothesis, linear and logistic multilevel regression analyses were performed to predict BMI and lifestyle factors in individuals nested in neighbourhoods. Results: Findings of multilevel analysis show little between-neighbourhood variations in BMI and health-related behaviours. 2% of BMI variation, 4% of media time variation and 3% of variation in snacking behaviour could be attributed to differences in neighbourhoods. Conclusion: Environmental factors are significantly associated with adolescent BMI and health-related behaviour, however their total effect is small. Due to these results recommendations for structural policy measures as part of prevention of overweight in adolescents must be made cautiously.
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