TABLE 1

Characteristics of the study patients and lung function from spirometry showing the highest reversibility at the diagnostic phase in steroid-naïve patients

Characteristics	Study patients (N=219)
Age, years	47±15
Age of asthma onset, years	47±15
Female	126 (57.5%)
BMI, kg·m^-2	27.1 (24.0–30.4)
Height, cm	170±10
Smoking history	113 (51.6%)
Current smokers	45 (20.5%)
Pack-years^#	15 (5–22)
Atopy^¶	67 (34.3%)
Blood eosinophils ×10⁹ per L	0.25 (0.17–0.40)
Total IgE, kU·L⁻¹	80 (34–170)
Pre-BD FEV₁, L	2.77±0.89
Pre-BD FEV₁, % predicted	78±17
Post-BD FEV₁, L	3.06±0.95
Post-BD FEV₁, % predicted	86±17
Pre-BD FVC, L	3.74±1.11
Pre-BD FVC, % predicted	87±16
Post-BD FVC, L	3.95±1.12
Post-BD FVC, % predicted	92±16
Pre-BD FEV₁/FVC	0.75 (0.68–0.81)
Post-BD FEV₁/FVC	0.79 (0.72–0.84)

Data are presented as mean±sd, n (%) or median (interquartile range). BMI: body mass index; Ig: immunoglobulin; FEV₁: forced expiratory volume in 1 s; BD: bronchodilator; FVC: forced vital capacity. ^#: Among those with any smoking history. ^¶: At least one positive skin prick test for common allergens.