Non-ventilatory failure group n=31 | Ventilatory failure group n=15 | t-Statistic (df) | Difference between means | Percentage of difference | p Value of t-statistic | |
---|---|---|---|---|---|---|

Age (years) | 53.2 (9.5) | 54.6 (8.1) | 0.492 (44) | +1.41 | +2.65 | 0.625 |

Weight (kg) | 130.6 (29.4) | 153.3 (36.8) | 2.256 (44) | +22.7 | +17.3 | 0.029* |

BMI (kg) | 45.1 (9.1) | 53.0 (12.3) | 2.201 (21.7)† | +7.9 | +17.5 | 0.039* |

R5 seated | 0.50 (0.22) | 0.58 (0.16) | 1.325 (44) | +0.083 | +16.8 | 0.192 |

R20 Seated | 0.33 (0.14) | 0.35 (0.10) | 0.538 (44) | +0.021 | +6.45 | 0.593 |

R5–R20 seated | 0.167 (0.12) | 0.22 (0.12) | 1.645 (44) | +0.062 | +37.6 | 0.107 |

R5 supine | 0.64 (0.20) | 0.79 (0.24) | 2.253 (44) | +0.15 | +23.6 | 0.029* |

R20 supine | 0.40 (0.12) | 0.46 (0.10) | 2.016 (44) | +0.070 | +17.7 | 0.05 |

R5–R20 supine | 0.24 (0.13) | 0.32 (0.19) | 1.488 (20.05)† | +0.080 | +33.1 | 0.152 |

*p<0.05. Data are presented as mean values with SDs in brackets.

†Levene's Test for homogeneity of variances violated (p<0.05), therefore t test not assuming equal variances performed.

R5, overall airways resistance; R20, large airways resistance; R5–R20, small airways resistance; BMI, body mass index.