TABLE I.

Summary of Genomic Loci Previously Associated With Intelligence

Locus	Refs.	Previous population
2q24.1-31.1	Posthuma et al. [2005]	Study = 1, population = 1 and 2, N = 950
	Luciano et al. [2006]	Study = 1, population = 1 and 2, N = 836
2q31.3	Butcher et al. [2008]	Study = 1, population = 3, N = 3,195
6p25-21.2	Posthuma et al. [2005]	Study = 1, population = 1 and 2, N = 950
	Luciano et al. [2006]	Study = 1, population = 1 and 2, N = 836
7q32.1	Butcher et al. [2008]	Study = 1, population = 3, N = 3,195
14q11.2-12	Buyske et al. [2006]	Study = 2, population = 1, N = 1,115
16p13.3	Butcher et al. [2008]	Study = 1, population = 3, N = 3,195

Study 1 is a family study, 2 is the COGA (Collaborative Studies on Genetics of Alcoholism) family study. Population 1 is from the Netherlands, 2 is from Australia, 3 is from the United Kingdom.

N indicates sample size.