Table 3. . Number of relatives with alcohol dependence across generations.

	None	One	2 or >	Range	Mean (± SD)	Total
1st degree relatives with AD†	224	162	51	0–2	0.60 (0.69)	437
2nd degree relatives with AD†	159	66	207	0–12	1.81 (2.01)	432
Weighted relatives with AD‡				0–8	1.49 (1.45)	441

^†First degree relatives are the offspring’s parents. Second degree includes grandparents, aunts and uncles.

^‡The weighted index counted each 1st degree relative as 1 with each 2nd degree relative counting as 0.5.

AD: Alcohol dependence.