Table. 1—

Baseline subject characteristics according to quartile of relative forced expiratory volume in one second (FEV1)

Quartile of relative FEV1p-values#
1234
FEV1 % pred cut-off≤89.0089.01–100.89100.90–112.16>112.16
Patients n405406406406
FEV1 % pred75.7±12.895.3±3.3106.6±3.2121.9±8.9<0.001
FEV1 L2.66±0.563.38±0.393.72±0.414.25±0.55<0.001
FVC % pred85.1±13.097.0±9.0104.4±7.9114.1±10.7<0.001
FVC L3.82±0.734.40±0.614.67±0.575.10±0.71<0.001
FEV1/FVC %69.8±10.577.4±7.280.0±6.583.7±7.3<0.001
Age yrs50.0±5.449.2±5.450.0±5.750.2±5.50.27
Height cm177±7177±6176±6177±60.65
Body mass index kg·m−224.5±3.124.5±2.724.7±2.724.7±2.50.06
Systolic blood pressure mmHg130±19130±18131±17131±170.11
Physical fitness kJ·kg−11.20±0.451.40±0.521.53±0.561.58±0.57<0.001
Serum cholesterol mmol·L−16.7±1.36.6±1.26.6±1.26.5±1.20.21
Smoking status %<0.001
 Never-smoker17233029
 Previous smoker24323339
 Current smoker
  1–10 cigarettes·day−119191214
  >10 cigarettes·day−140272518
Current smokers only n239184151130
 Number of pack-yrs22.2±11.019.8±10.818.9±9.316.7±9.1<0.001
  • Data are presented as n and mean±sd, unless otherwise stated. FVC: forced vital capacity. #: test for trend; : Chi-squared test. n = 1,623.