A longitudinal study of protective factors against substance use in early adolescence. An ecological approach

Adolescent substance use has been widely related to different individual, school, family and community factors. Yet, the number of studies with all these variables together in a model from an ecological perspective is still low, and they rarely used a longitudinal design. The aim of this study was to explore, from an ecological perspective, the prospective impact of different individual, school, family and neighbourhood factors on adolescent substance use.

This was a longitudinal study with a one-year follow up. There were 881 participants (M_age = 12.57; 48.1% females) at wave 1, of which 686 (M_age = 13.51; 51.8% females) were followed-up at wave 2. Validated questionnaires were used for data collection.

Regression analyses showed that higher substance use was predicted by high family socio-economic status cross-sectionally and longitudinally, and it was related to low neighbourhood socio-economic status cross-sectionally only. Participants who disliked school and had a poor academic performance were more likely to use substances, both cross-sectionally and longitudinally.

The inclusion of families in substance use prevention programmes could be a key component in these interventions. Moreover, promotion of a positive school climate could protect adolescents from using substances.