Table 3.
Cox analysis of independent prognostic factors for all chronic obstructive pulmonary disease (COPD) patients
| Items | B | Wald | Sig. | RR |
95.0% CI for RR |
|
|---|---|---|---|---|---|---|
| Lower | Upper | |||||
| Exacerbation frequency |
0.418 |
11.868 |
0.001 |
1.518 |
1.197 |
1.926 |
| FEV1% predicted |
-0.015 |
4.412 |
0.036 |
0.985 |
0.972 |
0.999 |
| Charlson Index |
0.201 |
7.311 |
0.007 |
1.222 |
1.057 |
1.413 |
| Age |
0.034 |
4.147 |
0.042 |
1.035 |
1.001 |
1.070 |
| NPPV |
-0.664 |
8.578 |
0.003 |
0.515 |
0.330 |
0.803 |
| PaCO2 |
0.022 |
4.373 |
0.037 |
1.023 |
1.001 |
1.044 |
| Cor pulmonale |
0.390 |
3.988 |
0.046 |
1.477 |
1.007 |
2.165 |
| BMI |
-0.087 |
11.383 |
0.001 |
0.917 |
0.872 |
0.964 |
| Total comorbidities | -0.297 | 7.790 | 0.005 | 0.743 | 0.603 | 0.915 |
RR, relative risk; FEV1, forced expiratory volume in one second; NPPV, non-invasive positive pressure ventilation; PaCO2, arterial carbon dioxide tension; BMI, body mass index.