Table 2.
Unadjusted and adjusted malaria parasitemia incidence and anemia incidence in ITN + IRS and ITN only by age group*
| ITN + IRS | ITN only | RR (95% CI) | Adjusted RR* (95% CI) | aPE* (95% CI) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Events | Person-years at risk | Rate per 100 person-years | Events | Person-years at risk | Rate per 100 person-years | ||||
| Malaria incidence | |||||||||
| Overall | 114 | 627 | 18 | 251 | 570 | 44 | 0.41 (0.31–0.56) | 0.38 (0.28–0.50) | 62 (0.50–0.72) |
| 6 months to 4 years | 21 | 146 | 14 | 57 | 133 | 43 | 0.34 (0.20–0.56) | 0.33 (0.18–0.62) | 67 (0.38–0.82) |
| 5–14 years | 70 | 220 | 32 | 137 | 186 | 74 | 0.43 (0.30–0.62) | 0.37 (0.26–0.54) | 63 (0.46–0.74) |
| ≥ 15 years | 23 | 261 | 9 | 57 | 251 | 23 | 0.39 (0.23–0.65) | 0.34 (0.18–0.64) | 66 (0.36–0.82) |
| Anemia incidence (hemoglobin < 8) | |||||||||
| Overall | 38 | 633 | 6 | 46 | 583 | 8 | 0.76 (0.49–1.19) | 0.83 (0.51–1.34) | 17 (−0.34–0.49) |
| 6 months to 4 years | 14 | 144 | 10 | 18 | 133 | 14 | 0.72 (0.35–1.47) | 0.99 (0.43–2.29) | 1 (−1.29–0.57) |
| 5–14 years | 3 | 228 | 1 | 6 | 196 | 3 | 0.43 (0.10–1.84) | 0.50 (0.15–1.70) | 50 (−0.70–0.85) |
| ≥ 15 years | 21 | 260 | 8 | 22 | 255 | 9 | 0.93 (0.50–1.73) | 0.85 (0.42–1.73) | 15 (−0.73–0.58) |
*
Adjusted for study clinic, baseline parasitemia, and housing type at baseline and seasonality and ITN use as time-varying variables.