Table 4—

Mean values (mean±sd (range)) of American Thoracic Society and European Respiratory Society acceptability and reproducibility criteria, sex differences and Pearson's correlation coefficients (R) for age, height and pulmonary function

CriterionMean±sd (range)AgeHeightSexFEV1 % predFVC % predFEV1%FVC
Vbe%FVC %3.3±1.7 (0.7–9.5)−0.30***−0.45***ns0.15**0.23***0.14**
Vbe L0.09±0.03 (0.04–0.24)0.14**0.27***nsnsnsns
tPEF s0.07±0.03 (0.01–0.22)−0.28***−0.28***nsnsns0.17
FET s4.3±2.5 (0.5–18.7)0.30***0.20***ns0.50***0.200.72***
ΔFVC mL58±50 (0–280)0.19***0.30***nsnsns0.14**
ΔFVC %2.3±2.1 (0–10.7)nsnsns0.29***0.24***0.19***
ΔFEV1 mL51±50 (0–330)0.20***0.28***nsnsnsns
ΔFEV1 %2.5±2.7 (0–14.6)nsnsns0.31***0.28***0.18**
  • FEV1: forced expiratory volume in one second

  • FVC: forced vital capacity

  • FEV1%FVC: FEV1 as a percentage of FVC

  • Vbe%FVC: backward extrapolated volume as percentage of FVC

  • Vbe: backward extrapolated volume

  • tPEF: time to peak expiratory flow

  • FET: forced expiratory time

  • ΔFVC: absolute difference between two highest FVCs

  • ΔFVC %: percentage difference between two highest FVCs

  • ΔFEV1: absolute difference between two highest FEV1

  • ΔFEV1 %: percentage difference between two highest FEV1

  • % pred: percentage of predicted value

  • ns: nonsignificant

  • **: p<0.01

  • ***: p<0.001