Table 1.

Subject characteristics

	COPD patients	Healthy controls (GOLD 0)	p-values
Number of subjects	324	185	NA
Number male subjects, %	170 (52%)	75 (41%)	0.0100
Age, years	64.9 (8.0)	65.0 (5.8)	0.94
BMI, kg/m2	28.4 (5.5)	29.3 (4.9)	0.07
Number current smoker, %	84 (26%)	45 (24%)	0.75
Pack years	51.4 (25.0)	39.3 (22.0)	< 0.0001
GOLD stages (I/II/III/IV)	79/144/78/23	NA	NA
FEV1, % predicted	62.4 (22.1)	98.0 (11.2)	< 0.0001
Decrease in FEV1 in 5 years, mL	209 (281)	218 (215)	0.70

Data presented as mean (SD) or number (% proportion), statistical significant results are depicted in bold

NA not applicable