Table 3 Post-hoc subgroup analysis of ATSB effect on clinical malaria incidence among children aged 1–14 years in clusters with low structure density (those with density of less than of 1 structure/hectare) and clusters with high structure density (≥ 1 structures/hectare)
Population | Control arm | Intervention arm | Unadjusted incidence rate ratio (95% CI) | p value | ||||
|---|---|---|---|---|---|---|---|---|
Number of clinical malaria episodes | Child-months of follow-up | Incidence per child per 6Â month season (95% CI) | Number of clinical malaria episodes | Child-months of follow-up | Incidence per child per 6Â month season (95% CI) | |||
Intention-to-treat | 2449 | 10955 | 1.38 (1.18–1.57) | 2313 | 11075 | 1.28 (1.06–1.50) | 0.91 (0.72–1.15) | 0.42 |
Subgroup: high structure density clusters | 617 | 3266 | 1.16 (0.90–1.43) | 669 | 4601 | 0.90 (0.69–1.11 | 0.79 (0.50–1.26) | 0.33 |
Subgroup: low structure density clusters | 1832 | 7780 | 1.44 (1.23–1.66) | 1644 | 6566 | 1.54 (1.28–1.80) | 1.05 (0.85–1.30) | 0.64 |