Table 3.

Factors associated with COPD in asymptomatic subjects (univariate analysis)

Variable	OR	95% CI	P-value
Sex*	0.838	0.444–1.580	0.585
Current smoker	1.534	0.061–3.812	0.356
Cigarettes/day	0.975	0.945–1.005	0.103
FEV1, mL	1.485	1.021–2.159	0.038
Age, years	1.002	0.976–1.029	0.833
Pack-years	0.988	0.974–1.002	0.101
Height, cm	1.025	0.985–1.067	0.213
Weight, kg	0.987	0.957–0.017	0.413

Note:

^*Reference category: female.

Abbreviations: CI, confidence interval; COPD, chronic obstructive pulmonary disease; FEV₁, forced expiratory volume in 1 second; OR, odds ratio.