Table 2.
Multivariate analysis for the primary outcome (death or readmission)
| Variables | Hazard ratio (95% CI) | P-value |
|---|---|---|
| Age | 1.03 (1.02–1.05) | <0.0001 |
| Severity of COPD | Reference (FEV1 ≥80%) | |
| 50%≤ FEV1 <80% | 2.17 (0.67–7.05) | 0.20 |
| 30%≤ FEV1 <50% | 3.17 (1.00–10.6) | 0.051 |
| FEV1 <30% | 4.65 (1.42–15.1) | 0.01 |
| Diabetes II | 1.47 (1.003–2.16) | 0.048 |
| Cancer | 2.79 (1.68–4.64) | <0.0001 |
| Creatinine at admission (µmol/L) | 1.003 (1.0004–1.006) | 0.02 |
| Respiratory rate (at admission) | 1.03 (1.003–1.05) | 0.028 |
Notes: 269 patients analyzed, with 191 events (90 observations not included due to missing data). Values in bold indicate P<0.05.
Abbreviations: CI, confidence interval; FEV1, forced expiratory volume in 1 s.