Table 2. Association of cumulative rainfall and semiannual follow-up period with risk for Leptospira infection, Salvador, Brazil, 2013–2015*.
| Variable | Odds ratio (95% CI) |
|---|---|
| Per year of age | 1.02 (1.02–1.03) |
| Male sex | 1.98 (1.48–2.64) |
| Cumulative rainfall, cm† |
0.986 (0.977–0.995) |
| Period | |
| 1 | Referent |
| 2 | 1.15 (0.63–2.10) |
| 3 | 0.30 (0.15–0.59) |
| 4 | 0.44 (0.20–0.97) |
*We used Generalized Estimating Equation to evaluate the association of rainfall, follow-up period, and patient age and sex on Leptospira infection, as ascertained by serologic evidence, assuming a dependence on the individual level across the 4 repeated measures. †Cumulative amount of rainfall experienced by participant between sequential samples.