Table 1. Patient demographics.

	Asthma (n=197)	Rule-out data (n=191)
Age, mean ± SD (median; interquartile range)	49±15 (50; 37–62)	45±15 (45; 33–58)
Gender (male/female)	84/113	78/113
Smoking history, n (%)
Never smoked	143 (72.6)	139 (72.8)
Ex-smoker	28 (14.2)	27 (14.1)
Current smoker	26 (13.2)	25 (13.1)
Inhalation medication history, n (%)
Under inhalation treatment	120 (60.9)	28 (14.7)
Never use inhalation device or stopped over 1 month ago	77 (39.1)	163 (85.3)
Diagnosis, n (%)
Bronchial asthma	137 (69.5)	–
Cough variant asthma	35 (17.8)	–
Asthma COPD overlap	25 (12.7)	–