| Variables | Test | df | p-value. | Odds ration | 95%*C.I. for Odds ratio | |
| Inferior | Upper | |||||
| ICU patients | 77,196 | 1 | <0.0001 | 3960 | 2913 | 5383 |
| Not vaccinated against influenza | 15,157 | 1 | <0.0001 | 1853 | 1358 | 2528 |
| Constant | 29,534 | 1 | <0.0001 |
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