Table 2.

Baseline Epidemiologic and Clinical Characteristics of COPDGene.

	No Exacerbations (N = 122)	Severe Exacerbations (N = 24)	p-Value
Gender
Male	54 (44.3%)	10 (42.7%)	0.99
Female	68 (55.7%)	14 (58.3%)
Age (years)
Mean (SD)	68.6 (8.8)	69.5 (9.16)	0.64
Race (% African American)	27 (22.1)	7 (29.2)	0.63
Current Smoking (%)	46 (37.7)	8 (33.3)	0.86
Pack Years Smoking
Mean (SD)	51.7 (26.6)	51.9 (28.8)	0.97
% predicted FEV1
Mean (SD)	53.9 (16.5)	53.2 (17.6)	0.85
FEV1/FVC
Mean (SD)	0.52 (0.12)	0.52 (0.11)	0.95
Asthma Diagnosed before Age 40 (%)	15 (12.3)	5 (20.8)	0.26

% predicted FEV1: Percent predicted forced expiratory volume in one second.