The ages for the 235 White male probands at each follow-up from T15 to T30 were 37.1 (SD = 3.02), 41.8 (3.06), 46.8 (3.20), and 51.4 (3.72), respectively, and by T30 they had completed an average of 17.6 (2.16) years of education. Reflecting the selection criteria used at T1 (Schuckit and Gold, 1988), about half (49.4%) of these probands had a father or mother with an AUD (41.7% of fathers and 15.3% of mothers). Across the 15 years from T15 to T30, the subjects reported 3.1 (2.38) drinks per drinking day on average, 9.0 (5.79) maximum drinks per occasion, and 59.6% gave a history of one or more of the 22 possible alcohol-related problems, with an average of 2.6 (3.98) problems per individual. For these SDPS probands, 39.6% fulfilled criteria for an AUD during their follow-up, including 24.3% with dependence and 15.3% with alcohol abuse only.
