Table 1.

Characteristics of COPD patients and health

	COPD	Health
Subjects (n)	21	11
Males (n)	20	9
Females (n)	1	2
Mean age (years)	66.19 ± 8.43	63.55 ± 6.58
Duration of disease (years)	12.95 ± 9.17	-
Smoking history (pack-years)	36.45 ± 20.18	-
Mean FEV1(L)	1.16 ± 0.38	2.45 ± 0.69
Mean FEV1%, predicted	45.62 ± 12.06	103.82 ± 17.05
Post-FEV1%, > 80% (n)	0	11
Post-FEV1% 50%-80% (n)	8	0
Post-FEV1% 30%-50% (n)	13	0
Mean FVC (L)	3.19 ± 0.86	3.21 ± 0.83
Mean FEV1/FVC(%)	36.76 ± 9.27	76.18 ± 4.47
Mean reversibility (%)	14.05 ± 13.33	-
Mean reversibility (L)	0.15 ± 0.13	-

Data are presented as mean ± SD.

FEV1, forced expiratory volume in 1 s. FVC, forced vital capacity.