Sex | Median (M) | Variability around the median (S) | Skewness (L) | |

FRC | Male | exp(−13.4898+0.1111*log(age)+2.7634*log(height)+Mspline) | exp(−1.60197+0.01513*log(age)+Sspline) | 0.3416 |

Female | exp(−12.7674+0.1251*log(age)+2.6049*log(height)+Mspline) | exp(−1.48310–0.03372*log(age)+Sspline) | 0.2898 | |

TLC | Male | exp(−10.5861+0.1433*log(age)+2.3155*log(height)+Mspline) | exp(−2.0616143–0.0008534*age+Sspline | 0.9337 |

Female | exp(−10.1128+0.1062*log(age)+2.2259*log(height)+Mspline) | exp(−2.0999321+0.0001564*age+Sspline) | 0.4636 | |

RV | Male | exp(−2.37211+0.01346*age+0.01307*height+Mspline) | exp(−0.878572–0.007032*age+Sspline) | 0.5931 |

Female | exp(−2.50593+0.01307*age+0.01379*height+Mspline) | exp(−0.902550–0.006005*age+Sspline) | 0.4197 | |

RV/TLC | Male | exp(2.634+0.01302*age–0.00008862*height+Mspline) | exp(−0.96804–0.01004*age+Sspline) | 0.8646 |

Female | exp(2.666+0.01411*age–0.00003689*height+Mspline) | exp(−0.976602–0.009679*age+Sspline) | 0.8037 | |

ERV | Male | exp(−17.328650–0.006288*age+3.478116*log(height)+Mspline) | exp(−1.307616+0.009177*age) | 0.5517 |

Female | exp(−14.145513–0.009573*age+2.871446*log(height)+Mspline) | exp(−1.54992+0.01409*age) | 0.5326 | |

IC | Male | exp(−10.121688+0.001265*age+2.188801*log(height)+Mspline) | exp(−1.856546+0.002008*age) | 1.146 |

Female | exp(−9.4438787–0.0002484*age+2.0312769*log(height)+Mspline) | exp(−1.775276+0.002673*age) | 0.9726 | |

VC | Male | exp(−10.134371–0.003532*age+2.307980*log(height)+Mspline) | exp(−2.1367411+0.0009367*age | 0.8611 |

Female | exp(−9.230600–0.005517*age+2.116822*log(height)+Mspline | exp(−2.220260+0.002956*age | 1.038 |

FRC: functional residual capacity; TLC: total lung capacity; RV: residual volume; ERV: expiratory reserve volume; IC: inspiratory capacity; VC: vital capacity.