Table 1. Characteristics of COPD patients in acute phase.

Variable	COPD patients
Subjects, n	78
Age, yrs	71.32±10.39
Smoking index (pack-year)	54.55±24.8
FVC (L)	2.12±0.37
FVC%	65.61±18.77
FEV1 (L)	0.73±0.31
FEV1%	28.55±16.38
FEV1/FVC	34.43±12.33

Data are shown as mean ± SEM. Smoking index, number of cigarettes/day × years of smoking history; FVC, forced vital capacity; FEV₁, forced expiratory volume in one second; COPD, chronic obstructive pulmonary disease.