Table 2.
Incidence rate and cumulative incidence of malaria in clusters treated with metofluthrin (active)- and placebo coils
| Wainyapu | Umbungedo | All villages | ||||
|---|---|---|---|---|---|---|
| Cluster 1 (W1) | Cluster 2 (W2) | Cluster 3 (U1) | Cluster 4 (U2) | Cluster 1 + 4 | Cluster 2 + 3 | |
| 90% Active+ 10% placebo | 10% Active+ 90% placebo | 10% Active+ 90% placebo | 90% Active+ 10% placebo | Active clusters | Placebo clusters | |
| Household active:placebo | 108 (98:10) | 114 (11:103) | 115 (12:103) | 108 (98:10) | 216 (196:20) | 229 (23:206) |
| Population | 368 | 523 | 596 | 633 | 1001 | 1119 |
| Samples | 42 | 44 | 43 | 41 | 83 | 87 |
| Malaria incident | 26 | 40 | 21 | 5 | 31 | 61 |
| Incidence density | ||||||
| Person-week | 652 | 602 | 866 | 888 | 1540 | 1468 |
| Incidence rate | 0.040 | 0.066 | 0.024 | 0.006 | 0.020 | 0.042 |
| Without clustering effect | ||||||
| RR (95% CI) | 0.484 (0.314–0.746) | |||||
| With clustering effect | ||||||
| RRGM (95% CI) | 0.652 (0.088–4.802) | |||||
| Cumulative incidence | ||||||
| Proportion of incidence | 0.619 | 0.909 | 0.488 | 0.122 | 0.373 | |
| Without clustering effect | ||||||
| RR (95% CI) | 0.533 (0.390–0.727) | |||||
| With clustering effect | ||||||
| Cluster-specific adjusted χ2 (P-value) | 2.356 (P = 0.124) | |||||
RR = rate ratio; CI = confidence interval.