Prior to analyses, data were checked for missing and out-of-range values and for deviations from normality. To examine change in alcohol report group status across time, Chi-square analyses examined group membership in the following categories for AAD: Abstainers/light drinkers < 0.50; Moderate drinkers = 0.50–0.99; Heavy drinkers = 1.00–1.99; Very heavy drinkers ≥ 2.00; and for AADD: Abstainers/light drinkers < 1.00; Moderate drinkers = 1.00–2.49; Heavy drinkers = 2.50–4.99; Very heavy drinkers ≥ 5.00. Paired t-tests and Wilcoxon Signed-Rank Tests next examined differences in the antenatal and retrospective AAD group alcohol distributions, as well as differences in maternal and kin reports. Finally, linear regression analyses examined the ability of both the antenatal and retrospective assessments of prenatal alcohol exposure to predict negative teen behavior. (For clarity, we note that both antenatal and retrospective reports of mothers’ drinking during pregnancy properly “predict” later outcomes of that pregnancy, such as birth weight or child behavior, etc. In contrast, the mothers’ current drinking, that is at the 14-year-assessment, does not properly “predict” outcomes, but is tested for significant “relations” to outcome.)
