Table 1.

Characteristics of extended families used in linkage analysis to identify loci for the number of grams of alcohol consumed per day.

Category	Sample sizeA	Mean ± SEM (Range)
No. of subjects per family	329	14.23 ± 0.46 (7–84)
No. of drinkers per pedigree	329	6.27 ± 0.24 (1–46)
Age of subjects	2565	43.14 ± .33 (5–83)
Male subjects	1233	42.23 ± 0.49 (11–82)
Female subjects	1332	43.97 ± 0.46 (5–83)
Age of drinkers	2063	42.85 ± 0.35 (13–81)
Male drinkers	1047	42.46 ± 0.50 (13–81)
Female smokers	1016	43.25 ± 0.50 (13–80)
No. of grams of alcohol consumed per day	2063	18.02 ± .54 (2–537)
Male drinkers	1047	24.96 ± 0.94 (2–537)
Female drinkers	1016	10.87 ± 0.40 (2–139)

^AThe sample sizes in the first two rows are numbers of pedigrees and those in the rest of the table are numbers of individual subjects.