Table. Demographic findings of the study subjects.

Variables		Total (male/female)	Age	Smoking (0/1)*	FEV1 (%pred)
Healthy controls		88 (49/39)	50.8 ± 9.8	88 (45/43)	-
Asthma patients		239 (103/136)	55.5 ± 14.5	239 (174/65)	83.9 ± 17.9
COPD patients		205 (196/9)	66.4 ± 7	205 (0/205)	47.2 ± 15.3
Lung cancer patients		324 (274/50)	65.7 ± 9	324 (79/245)	74.5 ± 21.9
P value
	Healthy vs. asthma	0.0576	0.0008	0.0004	-
	Healthy vs. COPD	< 0.0001	< 0.0001	< 0.0001	-
	Healthy vs. lung cancer	< 0.0001	< 0.0001	< 0.0001	-
	COPD vs. lung cancer	0.0002	0.3044	< 0.0001	< 0.0001

Data are shown as mean ± standard deviation or number (%).

COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 second.

^*Smoking: 0 means the person who does not smoke and 1 means the person who has a history of smoking.