Table 3.

Baseline Characteristics of Individuals Chosen from the COPDGene Study for Whole-Exome Sequencing

Group	Male Sex (%)	Age (yr)	Pack-Years	FEV1 % Predicted	Emphysema (% < −950 HU)
Cases of COPD (n = 204)	51	57.4 ± 4.0	50.3 ± 19.5	30.0 ± 10.1	29.5 ± 9.9
Resistant smoking control subjects (n = 195)	44	70.3 ± 3.9	49.8 ± 20.0	99.7 ± 9.7	1.8 ± 1.4

Definition of abbreviations: COPD = chronic obstructive pulmonary disease; HU = Hounsfield units.

Means (SE) are presented for age, pack-years, FEV₁ % predicted, and computed tomography emphysema for each phenotype group.