Volume 8, Number 9—September 2002
Research
The 2000 Tularemia Outbreak: A Case-Control Study of Risk Factors in Disease-Endemic and Emergent Areas, Sweden
Henrik Eliasson*, Johan Lindbäck†, J. Pekka Nuorti‡, Malin Arneborn†, Johan Giesecke†, and Anders Tegnell†
Table 2
Comparison of risk factors for tularemia in disease-endemic and -emergent areas, Sweden, 2000
| Univariate analysis | ||||||||
|---|---|---|---|---|---|---|---|---|
| Risk factors | Disease-endemic areas |
Emergent areas |
||||||
| Cases | Controls | Matched odds ratio | 95% CIa | Cases | Controls | Matched odds ratio | 95% CI | |
| Mosquito bites | 78/81 | 119/152 | 8.4 | 1.9 to 37 | 93/94 | 150/181 | 9.1 | 2.1 to 40 |
| Owning a cat | 37/84 | 29/159 | 4.4 | 2.2 to 9.0 | 29/105 | 38/195 | 1.6 | 0.8 to 3.0 |
| Farming | 15/81 | 8/152 | 7.5 | 2.1 to 27 | 9/101 | 15/186 | 0.8 | 0.3 to 2.3 |
| Visiting wooded areas | 50/79 | 85/152 | 1.1 | 0.6 to 1.9 | 75/100 | 102/186 | 2.4 | 1.3 to 4.3 |
| Multivariate analysis | ||||||||
| Mosquito bites | 7.6 | 1.6 to 36 | 9.4 | 2.1 to 43 | ||||
| Owning a cat | 4.0 | 1.6 to 10 | 1.2 to 5.5 | |||||
| Farming | 4.9 | 1.1 to 22 | ||||||
aCI, confidence interval.
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