Table 1.

Populations and samples

Center	Code	Reference	Number of families			Asthmatic sib pairs	Asthma prevalence*	Number of markers
			r	m	p
Southampton	UKS	11	131	60	49	112	.160	14
Oxfordshire	UKO	12	—	—	80	58	.160	8
Busselton	AuB	12	80	—	—	4	.070	10
Perth	AuP	13	98	—	25	77	.240	2
Finland	Fin	14	—	39	15	46	.070	17
Munchen	GerM	15	—	97	—	109	.075	22
Freiburg	GerF	16	72#	—	—	18	.075	5
Barbados	Bar	17	—	33	—	63	.165	5
U.S. African-American	USAA	2	—	114	—	195	.300	18
U.S. Caucasian	USC	2	—	112	—	183	.200	19
Fujian	China	18	—	9	23	32	.050	3

r, random nuclear; m, multiplex asthma pedigree; p, nuclear with asthma proband; #, selection on atopic proband. 

^*In general population, estimated by each center from its random sample or secondary sources.