Table 1 Study population and sample size for entomological and parasitological surveys by study areas.
|  | Intervention | Nonintervention | Buffer areas†| ||
|---|---|---|---|---|---|
Valley | Uphill | Valley | Uphill | ||
Approximate population | 2800 | 8800 | 2200 | 7400 | 10800 |
Mosquito survey: Mean number of houses sampled per survey | 24 | 79 | 29 | 65 | 103 |
Monthly parasite survey: Mean number of children sampled per survey | 45 | 75 | 48 | 134 | 84 |
Cohort study: Mean number of children sampled per survey | 113 | 154 | 112 | 249 | 321 |