Demographics | COPD (n=10) | NMD-CWD (n=6) | ORRF (n=12) | p Value |
---|---|---|---|---|

Age (years) | 66±10 | 58±22 | 59±16 | 0.54 |

BMI (kg/m^{2}) | 30.0±5.2 | 27.2±5.3 | 43.0±4.8 | <0.0001* |

FEV_{1} (% predicted) | 31.1±11.3 | 32.7±11.3 | 52.5±20.2 | <0.01* |

FVC (% predicted) | 52.4±9.7 | 30.5±10.7 | 55.6±19.0 | <0.01* |

FEV_{1}/FVC (% ratio) | 45.8±11.0 | 85.4±3.6 | 81.2±8.5 | <0.001* |

PaO_{2} (kPa) | 7.6±1.4 | 9.2±0.6 | 8.3±1.0 | <0.03* |

PaCO_{2} (kPa) | 7.9±1.0 | 6.6±1.0 | 7.1±0.9 | <0.04* |

HCO_{3}^{−} (mmols/l) | 33.5±3.2 | 30.8±3.8 | 31.5±3.8 | 0.28 |

*A one-way analysis of variance was used to compare the demographics between disease groups, p value <0.05 was taken to represent statistical significance.

BMI, body mass index; HCO

_{3}^{−}, serum bicarbonate level; NMD-CWD, neuromuscular disease with or without chest wall disease; ORRF, obesity related respiratory failure; PaCO_{2}, arterial carbon dioxide level; PaO_{2}, arterial oxygen level.