Volume 15, Number 7—July 2009
Research
Risk Factors for Human Infection with Puumala Virus, Southwestern Germany
Anne Caroline Schwarz
, Ulrich Ranft, Isolde Piechotowski, James E. Childs, and Stefan O. Brockmann
, Ulrich Ranft, Isolde Piechotowski, James E. Childs, and Stefan O. BrockmannTable 3
Influence of determinants on incidence of nephropathia epidemica, Baden-Württemberg, Germany, 2001–2007*
| Determinant | Risk ratio† | 95% Confidence interval | p value‡ |
|---|---|---|---|
| Supply of beechnut§ | 2.86 | 1.81–4.50 | <0.0001 |
| Cover of beech forest¶ | 1.94 | 1.69–2.22 | <0.0001 |
| Cover of seed plant¶ | 2.80 | 2.31–3.40 | <0.0001 |
| Winter temperature deviation# | 1.70 | 1.11–2.61 | 0.0156 |
| Spring temperature deviation# | 4.49 | 2.86–7.06 | <0.0001 |
| Human population density** | 1.12 | 1.01–1.23 | 0.0265 |
| Year of investigation†† | NA | NA | <0.0001 |
*Multivariate Poisson regression analysis; NA, not applicable.
†Mutually adjusted.
‡Likelihood ratio Test
§Good/excellent crop year referenced to a medium crop year.
¶Unit = 5%.
#Unit = 1°C.
**Unit = 500/km2.
††Dichotomized (Figure 2).
