Table 2.
Interactions Between Village Characteristics and Study Periods and the Risk of a Positive Malaria Test Result
| Characteristic | Preflood Period |
Postflood Period |
Interaction | ||
|---|---|---|---|---|---|
| RR | P Value | RR | P Value | P Value | |
| Contains river | 1.01 | .92 | 1.50 | <.001 | .003 |
| Location from river | |||||
| Downstream | Reference | Reference | <.001 | ||
| Upstream | 0.86 | <.001 | 1.02 | .41 | |
| Elevation quartile | |||||
| 1 (lowest) | Reference | Reference | |||
| 2 | 0.76 | .005 | 0.70 | <.001 | .44 |
| 3 | 0.73 | <.001 | 0.96 | .24 | .004 |
| 4 (highest) | 0.60 | <.001 | 0.59 | <.001 | .90 |
Abbreviation: RR, relative risk.