Table 3—

Prediction equations for healthy elderly European females

EquationR2rsd
FVC L0.0003171H2–0.0351A–6.368BSA+0.05925W+3.9600.5890.3046
FEV1 L0.0001726H2–0.0326A–2.303BSA+0.000122W2+3.3980.5270.2741
FEV1/FVC %−0.155H–0.184A+116.0960.0485.4974
FEV0.5 L0.00008072H2–0.0251A+1.4360.4320.2589
FEV2 L0.0001138H2–0.0334A+1.8440.5230.2963
FEV3 L0.0001218H2–0.0336A+1.7740.5290.3056
FEV6 L0.0003309H2–0.0346A–6.987BSA+0.06548W+4.1520.5660.3101
FEV1/FEV6 %−0.181H–0.178A+120.5440.0585.3530
FEF25% L·s−10.05351H–0.00000343A3–2.7560.1671.1193
FEF50% L·s−10.03414H–0.0540A+0.8900.1880.8234
FEF75% L·s−10.005960H–0.0150A+0.6600.1310.2467
PEF L·s−10.0002283H2–0.0644A+4.0010.2091.1932
FEF75–25% L·s−10.02030H–0.0440A+1.5380.2020.5828
FEF75–85% L·s−1−0.0644A+0.7350.0620.1345
TC25–50% s0.0000003057A3+0.2880.0250.1743
AEX L2·s−10.0005499H2–0.158A+3.7880.4191.7560
PIF L0.03154H–0.0553A+2.1390.1530.9248
MIF50% L·s−10.02934H–0.0566A+2.3630.1430.9552
FIV1 L0.03478H–0.143A+0.000006A3+4.7010.4110.3866

  • The lower limit of the normal is computed as: predicted value–1.645×residual standard deviation (rsd)

  • R2: adjusted coefficient of determination

  • FVC: forced vital capacity

  • FEV1: forced expiratory volume in one second

  • FEV0.5: forced expiratory volume in 0.5 seconds

  • FEV2: forced expiratory volume in two seconds

  • FEV3: forced expiratory volume in three seconds

  • FEV6: forced expiratory volume in six seconds

  • FEF25%: forced expiratory flow when 25% of the forced expiratory capacity has been exhaled

  • FEF50%: forced expiratory flow when 50% of the forced expiratory capacity has been exhaled

  • FEF75%: forced expiratory flow when 75% of the forced expiratory capacity has been exhaled

  • PEF: peak expiratory flow

  • FEF75–25%: forced mid-expiratory flow

  • FEF75–85%: forced mid-expiratory flow between 75–85% of FVC

  • TC25–50%: time constant between 25–50% of FVC

  • AEX: area delineated by forced expiratory flow/volume curve

  • PIF: peak inspiratory flow

  • MIF50%: forced inspiratory flow when 50% of the vital capacity has been inhaled

  • FIV1: forced inspiratory volume in one second

  • H: height in cm

  • A: age in yrs

  • BSA: body surface area in m2

  • W: weight in kg