During pregnancy, mothers reported drinking an average of 0.03 (SD = 0.01) ounces of absolute alcohol per day (AAD), well under the average of one standard drink per day (AAD = 0.5) that defines risk drinking (ACOG, 2006; Table 2). In contrast, 14 years later, mean retrospectively reported drinking was an average AAD of 0.47 (SD = 1.3), significantly more than the antenatal report (t = 5.68, df=287, p<0.001). Kin retrospective report of in-pregnancy alcohol consumption by the mothers was significantly higher than both maternal antenatal self-report (t=2.91, df=21, p=0.008) and maternal retrospective self-report (t=3.81, df=286, p<0.001). Similarly, maternal retrospective report of how much the women drank per drinking day (AADD) was significantly higher than the initial antenatal assessment (t=6.25, df=287, p<0.001). Retrospective kin report of AADD was higher than antenatal AADD (t=2.95, df=21, p=0.008) but not significantly different from maternal retrospective AADD report (p=0.16).
