Table 2.

Characteristics of subjects in COPD group [n = 40] and healthy volunteers group [n = 40]

	COPD group mean±SD	Healthy volunteers group mean±SD	P-value
Age	57.25±9.07	56.9±9.21	0.09
Duration of illness (yrs)#	10.67±4.89	Nil	-
Smoking (Pack years)#	39.95±20.94	Nil	-
Height(m)	1.677±.004	1.66±.005	0.142
PEFR(L)	3.42±1.27	7.59±0.30	<0.001*
FEV1(I/min)	1.48±0.50	2.90±0.12	<0.001*
FVC(I/min)	2.77±0.66	3.48±0.14	<0.001*

^*P < .05 — significant result.

^#As a prerequisite in our study protocol, healthy volunteers were asymptomatic and nonsmokers.