Data were available on 1,905 drinking subjects, including 842 males (44.2%), from ALSPAC with a mean (standard deviation) age of 17.8 (0.27) years and an age of onset for the first full drink of 13.6 (1.60) years. The correlation between LR and age of first drink was -.05 (p = .04). At the time of the current evaluation the males and females reported drinking alcohol on an average of 4.6 (3.90) days per month with an intake of an average 4.6 (2.55) U.K. standard units per drinking day (3.7 U.S.-based 10 gm drinks) and a lifetime maximum of 13.4 (7.34) drinks per occasion (10.7 U.S.-based drinks). Almost half (49.5%) of drinkers reported at least one repetitive (i.e., occurring more than twice) alcohol-related problem. The most common were alcohol-related blackouts (20.3%); drinking more than intended, having problems stopping drinking, spending a lot of time consuming alcohol, or the development of tolerance occurred in about 15% each; feeling guilty about drinking, neglecting obligations, or recognizing the need to cut down in about 7% each; and having heard complaints about their drinking, alcohol
