Table 2.
Distribution of the characteristics of the sample by need for hospital admission for pneumonia.
| Variables | Hospitalization | OR (95% CI) | Adj OR (95% CI) | |
|---|---|---|---|---|
| Yes | No | |||
| Age (means ± SD) | 83.5 ± 7.8 | 77.9 ± 7.7 | 1.091 (1.087–1.094) | 1.099 (1.096–1.103) |
| Sex [n (%)] | ||||
| Female | 2785 (0.5) | 561,330 (99.5) | Ref. | Ref. |
| Male | 2896 (0.7) | 420,255 (99.3) | 1.389 (1.312–1.463) | 1.822 (1.727–1.922) |
| Vaccination group [n (%)] | ||||
| ConVs group | 2819 (0.7) | 380,467 (99.3) | Ref. | Ref. |
| MixVs group | 861 (0.5) | 159,993 (99.5) | 0.726 (0.672–0.784) | 0.813 (0.760–0.869) |
| EnhVs group | 2001 (0.5) | 441,125 (99.5 | 0.612 (0.578–0.648) | 0.622 (0.58–0.661) |
| H3N2 mismatch [n (%)] | ||||
| no | 3286 (0.5) | 662,288 (99.5) | Ref. | Ref. |
| yes | 2395 (0.7) | 319,297 (99.3) | 1.512 (1.434–1.594) | 1.471 (1.379–1.570) |
| B mismatch [n (%)] | ||||
| No | 1023 (0.7) | 150,964 (99.3) | Ref. | Ref. |
| Yes | 4658 (0.6) | 830,621(99.4) | 1.207 (1.128–1.291) | 1.041 (0.958–1.131) |
| Previous vaccination against influenza [n (%)] | ||||
| No | 733 (0.5) | 136,373 (99.5) | Ref | Ref. |
| Yes | 4948 (0.6) | 845,012 (99.4) | 0.917 (0.842–0.992) | 0.752 (0.695–0.814) |
| Pneumococcal vaccination (n (%)) | ||||
| No | 2517 (0.5) | 455,743 (99.5) | Ref. | Ref. |
| Yes | 3164 (0.6) | 525,807 (99.4) | 1.090 (1.034–1.148) | 1.032 (0.979–1.089) |
Statistically significant data in bold. n: number of subjects.