Table 1.

Demographics and baseline characteristics

	Healthy volunteers n = 88	COPD patients n = 20
Male	88	12
Age, years	31.3 ± 8.8	60.4 ± 5.5
BMI, kg/m2	24.4 ± 2.9	24.5 ± 4.4
Time since diagnosis, years	NA	5.9 ± 4.4 (0.1–15.8)
Never smokers	75	-
Former smokers	13	20
Tobacco consumption, pack-years	NA	47.5 ± 25.1
FEV1, L	4.15 ± 0.53	1.23 ± 0.53
FEV1 (% predicted)	97.71 ± 10.28	43.40 ± 15.16
FVC, L	5.05 ± 0.66	2.76 ± 0.83
FVC (% predicted)	118.95 ± 13.76	98.03 ± 20.66
FEV1/FVC, %	82.43 ± 5.52	43.84 ± 10.41
FRC (% predicted)	-	180.28 ± 44.10
RV (% predicted)	-	220.71 ± 62.15
RV/TLC (% predicted)	-	164.86 ± 22.15

Results are presented by mean ± SD (min-max) or number of patients (n)

NA not applicable