Table 1.

Characteristics of Northeastern-, Southwestern-, and Combined-Sample Families with CHD

Criterion	SampleOrigina	No. ofAffectedSubjects	No. ofFamilies	AverageSibshipSize	FamilieswithTwoAffectedSibs	FamilieswithThreeAffectedSibs	FamilieswithFourAffectedSibs	No. ofMaleAffecteds	No. ofFemaleAffecteds	FamilieswithUnaffectedSibs	FamilieswithParentalData
I	NE	197	89	2.2	73	13	3	140	57	64	5
I	SW	127	56	2.3	43	11	2	86	41	35	7
I	All	324	145	2.2	116	24	5	226	98	99	12
II	NE	202	89	2.3	71	12	6	142	60	61	5
II	SW	162	67	2.4	43	20	4	106	56	31	10
II	All	364	156	2.3	114	32	10	248	116	92	15

^aNE = northeastern; SW = southwestern.