Table 6—

Constants and coefficients for polynomial prediction of the expected lower quartile, median and upper quartile for survival# using either forced expiratory volume in 1 s (FEV1) quotient (Q) or FEV1·height (Ht)−3

PredictorConstantIndexIndex2Index3RSDr2Limits
FEV1Q
 Lower quartile1.18-0.240.290.020.470.99840.5–7.5
 Median1.711.080.490.220.99950.5–6.0
 Upper quartile4.991.710.640.710.99600.5–5.0
FEV1·Ht−3
 Lower quartile1.12-5.3852.080.500.99790.05–0.75
 Median1.7411.9254.630.610.99680.05–0.60
 Upper quartile7.24-9.07141.750.071.00000.05–0.40
  • RSD: residual standard deviation. #: in years; : minima and maxima for the index for which the prediction is valid.