Table 1

Baseline characteristics (n=28 584)

Demographic characteristic
Age (years)44.6 (±7.2)
Gender (%, male)73.3
Height (m)1.74 (±0.09)
BMI (kg/m2)24.4 (±3.5)
Smoking status (%)
 Current smokers48.1
 Former smokers17.1
 Never smokers34.8
Prevalent diabetes (%)3.1
Prevalent COPD (%)0.3
Cholesterol (mmol/L)5.61 (±1.07)
ESR (mm/h)*5.0 (3.0–8.0)
Systolic BP (mm Hg)126 (±15)
Lung function measurement
 FEV1 (L)3.28 (±0.82)
 FEV1 (%predicted)95.2 (±17.9)
 FVC (L)4.20 (±1.01)
 FVC (%predicted)97.0 (±16.5)
 FEV1/FVC0.785 (±0.092)
 FEV1/FVC (%predicted)98.5 (11.4)
  • Data are presented as mean±SD unless otherwise stated. *Median values with 25th–75th percentiles for covariates with skewed distribution.

  • BMI, body mass index; BP, blood pressure; COPD, chronic obstructive pulmonary disease; ESR, erythrocyte sedimentation rate; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.