Table 1.

Baseline Characteristics of the Study Cohort^a,b

Baseline characteristic	Unmatched cohorts			Propensity score–matched cohorts
	Male cohort (n=6387)	Female cohort (n=8325)	P value	Male cohort (n=5990)	Female Cohort (n=5990)	P value
Age (y)	55.0±17.7	51.1 ±17.9	<.011	53.9±17.6	53.5±17.4	.22
Whitec	23.0	26.0	<.01	22.8	23.0	.87
Black or African American	16.1	19.5	<.01	16.4	17.5	.37
Asian	1.3	1.1	.24	1.3	1.3	.99
American Indian or Alaska Native	0.2	0.1	.20	0.2	0.2	.99
Native Hawaiian	0.2	0.1	.55	0.2	0.2	.99
COPD	5.8	3.4	<.01	4.1	4.3	.71
CAD	7.3	3.5	<.01	4.5	4.8	.54
Hypertension	28.1	25.1	<.01	25.5	25.0	.58
Diabetes mellitus	15.1	12.3	<.01	13.1	13.1	.89
Nicotine dependence	10.7	7.1	<.01	7.8	7.5	.49
Heart failure	7.4	5.8	<.01	6.1	6.3	.79
History of stroke	3.2	2.9	.24	2.9	2.9	.99
Obesityd	13.4	16.6	<.01	13.1	12.4	.2

^aCAD = coronary artery disease; COPD = chronic obstructive pulmonary disease.

^bData are presented as mean ± SD or as percentage.

^cRace was not recorded in ∼56% of patients.

^dObesity was defined as body mass index ≥ 30 kg/m².