Table 1.

Description of subjects

Diagnosis
COPD	Age (years)	Sex	Pack years	FEV1 It	FEV1/FVC (%)
1	64	F	60	0.50	38
2	62	F	50	0.52	26
3	61	M	40	0.77	39
4	61	M	50	0.60	24
5	62	M	50	0.90	32
6	65	F	30	0.49	32
7	63	M	45	1.00	37
Healthy controls
1	46–65	F	Nonsmoker
2	46–65	F	Nonsmoker
3	46–65	M	Nonsmoker

FEV1, forced expiratory volume in one second; FVC, forced vital capacity; pack years, number of cigarettes smoked per day × number of years smoked)/20.