Table 2– Z-scores for males and females for spirometric variables in the four datasets
Australia 1Australia 2PolandUSA
MaleFemaleMaleFemaleMaleFemaleMaleFemale
FEV1-1.73±1.46-1.54±1.55-1.31±1.32-1.05±1.37-1.49±1.55-1.36±1.54-0.25±1.60-0.14±1.53
FVC-1.00±1.41-0.91±1.40-1.00±1.30-0.84±1.35-0.96±1.49-1.02±1.460.07±1.520.11±1.43
FEV1/FVC-1.48±1.59-1.24±1.47-0.77±1.36-0.51±1.14-1.07±1.63-0.71±1.47-0.52±1.22-0.49±1.17
FEF25–75%-1.43±1.33-1.33±1.44-0.89±1.25-0.73±1.21-1.17±1.33-1.06±1.35-0.68±1.48-0.57±1.39
FEF75%NANANANA-0.57±1.24-0.27±1.19-0.31±1.36-0.25±1.35
  • Data are presented as mean±sd. FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; FEF25–75%: forced expiratory flow at 25–75% of FVC; FEF75%: forced expiratory flow at 75% of FVC; NA: not available.