Table 1—

Characteristics of subjects

Complete data setIncomplete data set#
Subjects nData
Subjects n17575
Age yrs57.4±13.57556.4±11.8
Pre-BD FEV1/FVC %67.0±9.87567.0±10.3
Pre-BD FEV1 % pred80.1±18.47579.7±21.5
Reversibility %8.7±8.8758.4±8.3
DL,CO/VA % pred95.9±15.47593.4±16.4
FRC % pred107.6±23.765104.2±20.3
Log IgE g·L−14.3±1.5724.1±1.7
FeNO ppb33.5±26.0529.8±36.5
Smoking history pack-yrs10.8±18.47510.5±14.8
  • Data are presented as mean±sd, unless otherwise indicated. BD: bronchodilator; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; % pred: % predicted; DL,CO: diffusing capacity of the lung for carbon monoxide; VA: alveolar volume; FRC: functional residual capacity; Ig: immunoglobulin; FeNO: exhaled nitric oxide fraction. #: data missing for at least one variable; : adjusted for haemoglobin concentration.