Table 2.
Influenza A(H1N1)pdm09 patient characteristics by group and the level of association (chi‐squared tests; P‐value) across the three disease severity groups
| Patient Characteristics | Group 1 | Group 2 | Group 3 | P‐value | |||
|---|---|---|---|---|---|---|---|
| Non fatal inpatients not in ICU | Non fatal patients in ICU | Fatal cases | |||||
| n*/N** | % | n/N | % | n/N | % | ||
| Age <1 year | 66/1056 | 6·3 | 21/860 | 2·4 | 3/355 | 0·8 | *** |
| Age ≥65 year | 186/1056 | 17·6 | 104/860 | 12·1 | 80/355 | 22·5 | 0·8 |
| Male | 575/1054 | 54·6 | 484/856 | 56·5 | 200/354 | 65·5 | 0·4 |
| Vaccinated | 92/635 | 14·5 | 95/619 | 15·3 | 33/210 | 15·7 | 0·6 |
| More than 1 condition | 428/649 | 66·0 | 422/579 | 72·9 | 225/255 | 88·2 | <0·01 |
| Complications: | <0·01 | ||||||
| ARDS | 53/711 | 7·5 | 351/649 | 54·1 | 151/309 | 48·9 | <0·01 |
| Pneumonia | 448/699 | 64·1 | 291/640 | 45·5 | 164/307 | 53·4 | <0·01 |
| Need for ventilation | 10/388 | 2·6 | 451/535 | 84·3 | 171/186 | 91·9 | <0·01 |
*Observation number.
**Total number of observations in the dataset.
***No P‐value due to low sample size.