Table 5

Mean differences and mean differences squared between values observed in the present study and predicted by various prediction equations

First author [ref.]Age yrsMalesFemales
Subjects nMean DIFFMean DIFF %Mean squared DIFFSubjects nMean DIFFMean DIFF %Mean squared DIFF
FEV1
 Present study16–9424790.040.860.2835560.030.870.14
 BrÄndli 118–6020560.000.040.292755−0.01−0.330.15
 Langhammer 1320–802249−0.06−1.560.293249−0.06−2.090.15
 Hankinson 1416–8024590.071.640.2934890.020.690.15
 ECSC 418–7022500.256.010.3531290.206.770.19
FVC
 Present study16–9424790.040.880.4435560.030.970.23
 BrÄndli 118–602056−0.14−2.770.482755−0.11−3.000.26
 Langhammer 1320–802249−0.05−0.920.463249−0.07−2.060.24
 Hankinson 1416–802459−0.04−0.810.453489−0.04−1.090.24
 ECSC 418–7022500.346.620.5731290.359.730.37
FEV1/FVC
 Present study16–9424790.00160.190.004335560.00480.570.0042
 Brändli 118–6020560.02252.730.004527550.02102.510.0044
 Langhammer 1320–802249−0.0026−0.320.004532490.00560.680.0044
 Hankinson 1416–8024590.02232.720.004834890.01561.870.0045
 ECSC 418–7022500.01992.430.004631290.02292.740.0046
  • FEV1: forced expiratory volume in one second

  • FVC: forced vital capacity

  • ECSC: European Coal and Steel Community

  • DIFF: difference