Table 4. Relative distribution of haplotypes at 17q21.31 in ethnic groups.

	Dataset #1			Dataset #2
	H2H2	H1H2	H1H1	H2H2	H1H2	H1H1
Caucasian	6	42	90	9	33	94
Asian	0	1	18	0	0	21
Latino	1	5	11	2	4	13
Unknown	0	1	4	0	2	2
Total	7	49	123	11	39	130

Ethnicity was inferred for 271 samples using SNP clustering compared to Hapmap data (see Methods). Self-reported ethnicity was used for an additional 88 samples.