Table 1.

Demographics and clinical characteristics of the cohort

	Total (n = 63)
Demographics
Age	40.78 (18–74)
Men, n (%)	49 (78%)
BMI, kg/m2	24.53 ± 3.20
Daily cigarette usage
Cigarettes per day	8.84 ± 7.63
Cumulative smoking exposure (pack-years)	17.59 ± 16.79
Lung function
FEV1 absolute	3.76 ± 1.14
FEV1, % predicted	95.64 ± 20.47
FEV1/FVC	0.74 ± 0.14
Presence of COPD	18 (29%)

Data are n (%), mean (range), or mean (±SD). BMI, body mass index. Pack-years is defined as the number of packs per day smoked multiplied by smoking duration (in yr). FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; COPD,  chronic obstructive pulmonary disease.