Volume 19, Number 5—May 2013
Research
Changes in Severity of Influenza A(H1N1)pdm09 Infection from Pandemic to First Postpandemic Season, Germany
Table 3
Factors independently associated with severe clinical outcome, University Hospital Heidelberg, 2009/10–2010/11, Germany*†
| Characteristic | No. patients with severe disease | Total no. patients | Relative risk (95% CI) | p value |
|---|---|---|---|---|
| Age, y | ||||
| 0–14 | 5 | 85 | 1 (Ref) | |
| 15–64 | 33 | 76 | 6.61 (2.83-15.42) | <0.01 |
| >65 | 12 | 17 | 9.55 (3.94-23.13) | <0.01 |
| Season | ||||
| 2009–10 | 15 | 102 | 1 (Ref) | |
| 2010–11 | 35 | 76 | 1.64 (1.02-2.62) | 0.04 |
| Chronic lung disease | ||||
| No | 39 | 156 | 1 (Ref) | |
| Yes | 11 | 22 | 1.89 (1.16-3.09) | 0.01 |
| Sex | ||||
| F (not pregnant) | 18 | 77 | 1 (Ref) | |
| F (pregnant) | 1 | 9 | 0.36 (0.06-2.36) | 0.29 |
| M | 31 | 92 | 1.67 (1.09-2.57) | 0.02 |
*Ref, reference category for risk calculations.
†Variables (listed in Table 1) that did not reach the significance level of 5% are omitted.
1These authors contributed equally to this article.
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