TABLE 1.

Clinical characteristics for those subjects with collected lung tissues.

	HN(n = 12)	HS(n = 12)	SC(n = 16)
Age (yrs)	61.5(1.3)	60.3(3.0)	62.7(1.7)
Gender	12/0	12/0	16/0
Smoking (pack-yrs)	0	40.0(7.4)*	41.2(6.0)*
FEV1% predicted	104.1(3.4)	93.1(4.5)	82.7(6.7)*
FEV1/FVC	83.3(2.1)	74.5(2.0)*	60.6(2.5)*#

Values are expressed as mean(SEM); HN, healthy non-smoker. HS, healthy smoker. SC, smoker with COPD; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; *<0.05 vs. patients in HN group; ^#<0.05 vs. patients in HS group.