Parameter estimate | SE | Type III SS | Significance | |
---|---|---|---|---|

SE, standard error for the parameter estimate; SS, sum of squares; BMI, body mass index; FEV_{1}, forced expiratory volume in 1 second; 6MWT, 6 minute walk test. | ||||

All of the effects were examined simultaneously (that is, the magnitude of each main effect or interaction was examined after controlling for all the other main effects and interactions). | ||||

The total sum of squares was 6.83; R^{2} estimate = 0.31. | ||||

The following variables were included in the full model but excluded because they failed the significance limit (p<0.15): history of IHD, Tlco % predicted, SGRQ composite score. | ||||

Age | −0.02 | 0.01 | 1.38 | 0.009 |

Sex | −0.16 | 0.10 | 0.51 | 0.107 |

Pack years | 0.18 | 0.12 | 0.43 | 0.141 |

BMI | 0.04 | 0.01 | 2.84 | <0.001 |

FEV_{1} (% predicted) | 0.81 | 0.43 | 0.67 | 0.065 |

6MWT | −1.14 | 0.44 | 1.29 | 0.012 |

COPD exacerbation history | −0.16 | 0.10 | 0.52 | 0.106 |