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Early use of alcohol associated with sociodemographic, nutritional and lifestyle factors: survival analysis with Brazilian students.

BACKGROUND: To evaluate the early age of onset (AOO) of alcohol consumption and its association with sociodemographic, nutritional and lifestyle characteristics.

METHODS: A national cross-sectional multi-centered study assessed 12-17-year old adolescents from 1247 public and private schools in 124 Brazilian municipalities with more than 100 000 habitants. Our variable of interest was the AOO of alcohol consumption. Covariates comprised sociodemographic status, lifestyle habits and nutritional parameters. We used adapted survival models to investigate the association between covariates and the AOO of alcohol consumption.

RESULTS: From a sample of 67 672 adolescents, 50% were females. The mean AOO of alcohol consumption was 12.9 years. Male adolescents had a lower mean age of alcohol experimentation when compared to females in Northeast and South regions. The difference between private and public school for AOO was observed only for the Northeast Region (12.6 versus 13.1, respectively). Adolescents who reported smoking or mental health problems or from the Southern Region presented earlier alcohol use. Physical activity and overweight were positively associated with earlier use of alcohol.

CONCLUSIONS: There is no homogeneity in the AOO of alcohol consumption among adolescents, which should be considered when formulating public policies and government campaigns directed toward reducing alcohol consumption.

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