Multivariable analysis: clinical parameters independently predictive of severe outcomes in pandemic influenza during the 2009–2010 pandemic (n=1520)
| Clinical parameter | Adjusted* OR (95% CI) | p Value |
| Delayed admission | 1.67 (1.09 to 2.56) | 0.019 |
| Radiologically confirmed pneumonia | 1.83 (1.27 to 2.64) | 0.001 |
| Presenting symptoms | ||
| Dyspnoea | 1.22 (0.88 to 1.67) | 0.231 |
| Altered consciousness | 6.53 (3.73 to 11.41) | <0.001 |
| Required supplemental oxygen on admission | 4.34 (3.09 to 6.08) | <0.001 |
| Intravenous fluid replacement on admission | 1.86 (1.30 to 2.66) | 0.001 |
| Clinical parameters | ||
| C-reactive protein (mg/dl) (≥100 vs <100) | 3.78 (2.41 to 5.94) | <0.001 |
↵* Each variable has been adjusted for all other variables in the model.