All patients with severe influenza |
Unvaccinated in the current and previous seasons | 58/189 | Ref. | Ref. | |
Unvaccinated in the current and vaccinated in any previous season | 25/97 | 0.84 (0.49–1.43) | 0.79 (0.43–1.43) | 0.4 |
Vaccinated in the current and unvaccinated in previous seasons | 10/21 | 1.55 (0.69–3.48) | 2.22 (0.89–5.51) | 0.09 |
Vaccinated in the current and any previous season | 37/291 | 0.41 (0.26–0.65) | 0.45 (0.26–0.76) | 0.003 |
All patients with influenza who were admitted to ICU |
Unvaccinated in the current and previous seasons | 40/189 | Ref. | Ref. | |
Unvaccinated in the current and vaccinated in any previous season | 16/97 | 0.78 (0.42–1.46) | 0.74 (0.37–1.50) | 0.4 |
Vaccinated in the current and unvaccinated in previous seasons | 4/21 | 0.90 (0.29–2.77) | 1.14 (0.34–3.87) | 0.8 |
Vaccinated in the current and any previous season | 17/291 | 0.28 (0.15–0.50) | 0.35 (0.17–0.70) | 0.003 |
Patients with influenza who died within 30 d after hospital admission |
Unvaccinated in the current and previous seasons | 32/189 | Ref. | Ref. | |
Unvaccinated in the current and vaccinated in any previous season | 19/97 | 1.16 (0.62–2.15) | 1.09 (0.52–2.31) | 0.8 |
Vaccinated in the current and unvaccinated in previous seasons | 7/21 | 1.97 (0.77–5.51) | 3.35 (1.06–10.58) | 0.04 |
Vaccinated in the current and any previous season | 25/291 | 0.51 (0.29–0.88) | 0.44 (0.23–0.86) | 0.02 |