Table 1.

Characteristics of childhood asthma subjects compared to subjects without asthma in COPDGene

	Childhood Asthma	Never Asthma	P-value
	N = 730	N = 7493
Male gender (%)a	388 (53%)	4255 (57%)	0.06
Mean age, year (SD)c	58 (9)	60 (9)	< 0.001
Non-Hispanic white (%)a	391 (54%)	5075 (68%)	< 0.001
African American (%)a	339 (46%)	2418 (32%)	< 0.001
Pack-years of smoking (SD)b	43 (25)	44 (25)	0.09
Current smoking (%)a	410 (56%)	4041 (54%)	0.26
History of hay fever (%)a	385 (53%)	1727 (23%)	< 0.001

Univariate analysis with ^a Chi-square ^b Wilcoxon rank sum test ^c t-test