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 1
Results of case-control analysis of risk factors for outbreak-associated tularemia, Sweden, 2000
| Risk factors | Cases | Controls | Matched odds ratio | 95% confidence interval |
|---|---|---|---|---|
| Univariate analysis | ||||
| Mosquito bites | 196/202 | 313/392 | 8.3 | 3.3 to 21 |
| Owning a cat | 69/218 | 82/414 | 2.0 | 1.3 to 3.1 |
| Farming | 30/210 | 24/397 | 3.2 | 1.6 to 6.3 |
| Visiting wooded areas | 146/206 | 221/397 | 1.7 | 1.2 to 2.5 |
| Owning a dog | 32/218 | 73/414 | 0.75 | 0.45 to 1.3 |
| Visiting golf courses | 37/215 | 34/398 | 1.7 | 0.9 to 3.0 |
| Visiting lakes and rivers | 160/212 | 259/391 | 1.5 | 0.95 to 2.3 |
| Multivariate analysis | ||||
| Mosquito bites | 196/202 | 313/392 | 8.8 | 3.3 to 23 |
| Owning a cat | 69/218 | 82/414 | 2.5 | 1.5 to 4.2 |
| Farming | 30/210 | 24/397 | 3.2 | 1.4 to 7.0 |
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