Table 3.
Multivariate analysis for the primary outcome with predictive miss-matching data imputation
| Variables | Hazard ratio (95% CI) | P-value |
|---|---|---|
| Age | 1.02 (1.009–1.038) | 0.001 |
| Severity of COPD | Reference (FEV1 ≥80%) | |
| 50%≤ FEV1 <80% | 1.47 (0.53–4.09) | 0.45 |
| 30%≤ FEV1 <50% | 2.06 (0.75–5.66) | 0.15 |
| FEV1 <30% | 2.65 (0.94–7.49) | 0.06 |
| Diabetes II | 1.80 (1.28–2.54) | 0.0006 |
| Cancer | 1.60 (1.01–2.53) | 0.043 |
| Creatinine at admission (µmol/L) | 1.03 (1.005–1.05) | 0.01 |
| PaCO2 at admission (kPa) | 1.11 (1.02–1.20) | 0.007 |
| Procalcitonin at admission (µg/L) | 1.005 (0.99–1.01) | 0.17 |
| Albumin at admission (mmol/L) | 0.97 (0.94–1.003) | 0.08 |
| Blood pressure at admission (mmHg) | 0.99 (0.98–0001) | 0.054 |
| Respiratory rate at admission | 1.03 (1.01–1.05) | 0.002 |
| Weight at admission (kg) | 0.99 (0.98–0.99) | 0.03 |
Note: P-value in bold when <0.05.
Abbreviations: CI, confidence interval; FEV1, forced expiratory volume in 1 s; PaCO2, partial pressure of carbon dioxide.