Table 1.

Indices of SLC6A1 nucleotide diversity in five populations.

Populations	Number of polymorphic sites	Nucleotide diversity per bp (π) (10-4)	Watterson's estimator of theta (θ) (10-4)	Mean number of heterozygous SNPs per person
European-American	21	1.72	1.41	6.57
African-American	41	2.77	2.55	12.22
Finnish	29	2.11	1.87	8.63
Thai	31	2.14	2.00	8.38
Hmong	24	1.62	1.55	3.75