Table 1

Individuals eligible for analysis in each stage, by outcome

	Eligible at baseline	Follow-up data available	Included in the analyses*
Onset of drunkenness	1120	974	917
Drunk more than 10 times	1268	1080	986
Regular smoking	1268	1080	923
Onset of illicit drug use	1251	1068	984

*Numbers of complete cases (no missing data) used in the multivariate analyses.