Table 1.

General characteristics of COPD cases and controls

Variables	COPD (n = 111)	Control (n = 111)	P-value*
Age	56.09 ± 8.95	53.87 ± 9.58
Duration of disease	5.23 ± 3.91	0.00 ± 0.00	< 0.001
MET	2040.91 ± 1590.29	5713.79 ± 2370.42	< 0.001
FEV1	63.16 ± 18.23	88.00 ± 10.61	< 0.001
FEV1/FVC	60.95 ± 10.02	80.94 ± 4.94	< 0.001

Values are indicated as mean ± standard deviation

Independent sample T-test was applied for groups comparison

BMI body mass index, MET metabolic equivalent, FEV1 forced expiratory volume in 1 s, FVC forced vital capacity

*The p < 0.05 was considered as significant