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Volume 19, Number 5—May 2013

Research

Changes in Severity of Influenza A(H1N1)pdm09 Infection from Pandemic to First Postpandemic Season, Germany

Nicola Lehners1, Steffen Geis1, Christoph Eisenbach, Kai Neben, and Paul SchnitzlerComments to Author 
Author affiliations: Author affiliation: University of Heidelberg, Heidelberg, Germany

Main Article

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.

Main Article

1These authors contributed equally to this article.

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