13.6gm of alcohol such as 12oz beer, 5–6 oz table wine or 1.5oz 80-proof spirit. Outlying SRE scores were unadjusted in the analysis. Total effect score (SRTT) was the mean score obtained by adding the number of drinks from the three indices and dividing by the number of cells for which standard drinks were reported (Schuckit et al., 1997a). Data on the period of heaviest drinking was used to derive a variable on maximum drinks, as this data was not collected during the study. Maximum drinks were estimated as the highest number of standard drinks consumed during the period of heaviest drinking.
