Table 1.

Summary of subject demographics and baseline characteristics

Demographics and measurements	Non-COPD NSC group (N=10)	Non-COPD SC group (N=10)	COPD group (N=10)
Demographics
Age, years	69.4±5.2	64.8±7.8	62.2±6.6
Sex, males/females	5/5	9/1	7/3
Height, cm	158.3±4.3	165.7±7.0	159.9±6.8
Weight, kg	59.3±11.2	63.0±10.5	48.9±7.3
Smoking history
Current/former/never	0/0/10	8/2/0	3/7/0
Number of pack-years	0	44.3±35.0	65.4±30.2
Spirometry
FVC, L	3.1±0.9a	3.8±0.9b	2.8±0.8
FEV1, L	2.4±0.7c	2.9±0.7d	1.2±0.9
FEV1, %predicted	79.5±4.2d	76.6±5.8c	40.4±17.6
FEV1/FVC, %	79.5±4.2d	77.0±5.6c	39.6±17.9

Notes:

^aP<0.05,

^bP<0.01,

^cP<0.005, and

^dP<0.0001 (difference between COPD group and non-COPD NSC group/non-COPD SC group, by Dunnett’s test).

Abbreviations: COPD, chronic obstructive pulmonary disease; FEV₁, forced expiratory volume in 1 second; FVC, forced vital capacity; SC, smoking controls; NSC, nonsmoking controls.