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To estimate associations between age of first drinking (AFD) and alcohol use disorder, nicotine dependence, cannabis dependence, illicit drug dependence, major depression and anxiety disorder in adulthood, net of a series of covariate factors.

Data were obtained from a longitudinal birth cohort.

Christchurch, New Zealand.

The Christchurch Health Development Study (CHDS), a longitudinal study of a cohort born in 1977 and studied to age 35 years. Analysis samples ranged in size from 1056 (ages 11–13 years) to 962 (age 35 years); 50.2% of the total sample was male.

A measure of AFD (ages 5–13+ years) was generated using latent class analysis. Outcome measures included: major depression, anxiety disorders, alcohol use disorder, nicotine dependence, cannabis dependence and other illicit drug dependence during the period 15–35 years. Covariate …