Table 2.
Predicting Long-term Mortality Using Cox Regression
| Characteristics | Hazard Ratio (95% CI) | P Value |
|---|---|---|
| Univariate analysis (N = 92) | ||
| 3-level APACHE II score | 1.76 (1.16 to 2.65) | .007 |
| Male sex | 0.60 (0.33 to 1.08) | .087 |
| 60 pack-years or more | 1.53 (0.83 to 2.83) | .172 |
| Current smoker | 0.74 (0.40 to 1.36) | .329 |
| pCO2 greater than or equal to 60 mmHg | 2.31 (1.08 to 4.91) | .030 |
| Any comorbidity | 2.58 (1.36 to 4.88) | .004 |
| Length of stay | 1.00 (0.98 to 1.04) | .575 |
| Multivariate analysis (N = 65) | ||
| 3-level APACHE II score | 2.19 (1.27 to 3.80) | .001 |
| Male sex | 0.47 (0.21 to 1.03) | .060 |
| 60 pack-years or more | 2.32 (1.08 to 4.97) | .030 |
| pCO2 greater than or equal to 60 mmHg | 2.68 (1.10 to 6.50) | .030 |
| Any comorbidity | 3.34 (1.46 to 7.60) | .004 |
pCO2, partial presence of carbon dioxide.