Table 1.

Demographic data of resistant smokers and COPD subjects

	Resistant smokers	COPD	p value
Gender (M/F)	7/23	34/28	<0.01*
Age	65.7 ± 5.3	57.7 ± 7.0	<0.0001#
Pack year	62.2 ± 20.6	45.7 ± 19.0	0.0003#
FEV1/FVC%	76.9 ± 5.9	29.5 ± 9.5	<0.0001#
% predicted FEV	103.9 ± 11.4	25.8 ± 11.4	<0.0001#
% predicted DLCO	N/A	32.8 ± 16.5	N/A

^*Fisher exact test

^# t test