Prevalence and socio-demographic correlates of drug use among adolescents: results from the Mexican Adolescent Mental Health Survey.

Aims: To estimate the life-time and 12-month prevalence of illicit drug use among Mexican adolescents, the age of onset of first drug use and the socio-demographic correlates.

Method: A multi-stage probability survey of adolescents aged 12-17 years residing in the Mexico City Metropolitan Area was carried out in 2005. Adolescents were administered the computer-assisted adolescent version of the World Mental Health Composite International Diagnostic Interview by trained lay interviewers in their homes. The response rate was 71% (n = 3005). Descriptive and logistic regression analyses were performed considering the multi-stage and weighted sample design of the survey.

Findings: Of the adolescents, 5.2% have ever tried illicit drugs, 2.9% in the last 12 months. The most frequently used drugs are marijuana, followed by tranquilizers/stimulants. The median age of first use is 14 years. Correlates of life-time drug use are older age, having dropped out of school, parental drug problems, low religiosity and low parental monitoring.

Conclusions: While drug use among Mexican adolescents is lower than among adolescents from other developed countries, its increasing prevalence with age and the narrowing male/female ratio calls for firm public health actions, particularly prevention strategies.