Table 1. Description of pedigree data from 14 villages in the Tibet Autonomous Region.

No. of generations	No. of pedigrees	Pairs	Count	Individuals	Count
2	97	Parent/Off	1,949	Male	1,382
3	92	Sib/Sib	2,330	Female	1,579
4	111	Sis/Sis	627	Unknown	0
5	24	Bro/Bro	553	Total	2,961
6	4	Bro/Sis	1,150
		Grandp.	580	Founder	128
		Avunc.	2,528	Nonfounder	2,833
		Half sib	93	Singletons	0
		Cousin	2,943	Total	2,961

Off, offspring; Sib, sibling; Bro, brother; Sis, sister; Grandp., grandparent; Avunc., avuncular.