Reliability of Chest Wall Mobility and Its Correlation with Lung Functions in Healthy Nonsmokers, Healthy Smokers, and Patients with COPD

Table 1

Demographic and lung parameter characteristics of healthy nonsmokers, healthy smokers, and COPD patients.

	Healthy nonsmokers (); Mean ± SD	Healthy smokers (); Mean ± SD	COPD patients (); Mean ± SD	P value for group difference
Age (years)	23.6 ± 5.3	23.6 ± 3.8	52.0 ± 13.7	<0.001
BMI (kg/m^2)	24.1 ± 3.8	23.8 ± 4.9	29.5 ± 6.7	0.001
FEV1 (L)	5.1 ± 0.6	4.2 ± 0.9	2.5 ± 0.8	<0.001
FVC (L)	5.1 ± 0.8	5.2 ± 1.0	3.0 ± 0.7	<0.001
FEV1/FVC	90.7 ± 3.6	88.0 ± 3.5	73.7 ± 5.6	<0.001
VC (L)	5.2 ± 1.0	4.8 ± 0.9	3.1 ± 1.0	<0.001

COPD = chronic obstructive pulmonary disease; BMI = body mass index; FEV1 = forced expiratory volume in 1 second; FVC = forced vital capacity. Values are mean ± SD unless otherwise indicated.