AUC | 95% CI | Cut-off value | False-positive rate % | p-value | |

MEF_{75} % pred | 0.93 | 0.82–1.04 | <58 | 8 | 0.001 |

FEV_{1} % pred | 0.93 | 0.82–1.04 | <67 | 14 | 0.001 |

MEF_{25} % pred | 0.91 | 0.78–1.04 | <19 | 25 | 0.002 |

Tiffeneau index^{¶} | 0.90 | 0.77–1.03 | <66 | 17 | 0.003 |

P_{a,O2} after HIT kPa | 0.85 | 0.68–1.02 | <7.1 | 28 | 0.009 |

P_{a,O2} baseline kPa | 0.85 | 0.66–1.03 | <9.9 | 12 | 0.01 |

S_{a,O2} baseline % | 0.76 | 0.59–0.93 | <96 | 33 | 0.016 |

The cut-off values and false-positive rates correspond to a sensitivity of ≥75%. AUC: area under curve; CI: confidence interval; MEF

_{75}: maximal expiratory flow when 75% of the forced vital capacity (FVC) remains to be exhaled; FEV_{1}: forced expiratory volume in one second; MEF_{25}: maximal expiratory flow when 25% of the FVC remains to be exhaled; HIT: hypoxia inhalation test;*S*_{a,O2}: arterial oxygen saturation; % pred: percentage of the predicted value.^{#}: the greater the AUC the better the predictive value of the baseline parameter (see fig. 2⇑);^{¶}: FEV_{1}/FVC.