Individual cohort reports.

AA, alcohol abuse; AD, alcohol dependence; AHRS, Adolescent Health Risk Study; AU, alcohol use; AUD, alcohol use disorder.aIncludes only not married/cohabiting young adults and sampled only those with a driving licence. Also partial overlap between this sample and Shope.bMen only.cSame-sex twins only.dLow income first born sample.eVarious earlier data requirements met.fAUD at 18 excluded in analyses examining the course of AUD.gPreviously participated in all four survey waves.hExcluded those not living with either parent and those already driving at study entry, and those who did not obtain a driving license during the study period.iBlack only.