Predictor | Constant | Index | Index^{2} | Index^{3} | RSD | r^{2} | Limits^{¶} |

FEV_{1}Q | |||||||

Lower quartile | 1.18 | -0.24 | 0.29 | 0.02 | 0.47 | 0.9984 | 0.5–7.5 |

Median | 1.71 | 1.08 | 0.49 | 0.22 | 0.9995 | 0.5–6.0 | |

Upper quartile | 4.99 | 1.71 | 0.64 | 0.71 | 0.9960 | 0.5–5.0 | |

FEV_{1}·Ht^{−3} | |||||||

Lower quartile | 1.12 | -5.38 | 52.08 | 0.50 | 0.9979 | 0.05–0.75 | |

Median | 1.74 | 11.92 | 54.63 | 0.61 | 0.9968 | 0.05–0.60 | |

Upper quartile | 7.24 | -9.07 | 141.75 | 0.07 | 1.0000 | 0.05–0.40 |

RSD: residual standard deviation.

: in years;^{#}: minima and maxima for the index for which the prediction is valid.^{¶}