Table 2.
Microscopy Results by Survey, Study Arm, and Age Category
| Characteristic | Baseline | Year 1 | Year 2 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Control | Intervention | Control | Intervention | Control | Intervention | |||||||
| Tested | % Positive | Tested | % Positive | Tested | % Positive | Tested | % Positive | Tested | % Positive | Tested | % Positive | |
| Blood smear results | ||||||||||||
| All ages | 1008 | 36.8 (32.0–41.6) | 919 | 33.9 (28.0–39.9) | 1016 | 39.4 (34.2–44.5) | 896 | 31.8 (25.8–37.8) | 907 | 36.1 (30.2–41.9) | 841 | 29.8 (24.0–35.7) |
| <5 y | 151 | 43.7 (29.4–58.0) | 152 | 31.6 (17.0–46.2) | 140 | 32.9 (23.3—42.4) | 142 | 31.2 (22.7–39.7) | 136 | 39.0 (30.7–47.2) | 117 | 29.1 (21.4–36.7) |
| 5–14 y | 321 | 57.9 (51.5–64.4) | 297 | 55.6 (43.5–67.6) | 358 | 61.2 (53.6–68.7) | 303 | 49.5 (43.5–55.6) | 289 | 57.4 (47.4–67.5) | 278 | 42.8 (30.6–55.0) |
| ≥15 y | 536 | 22.2 (18.2–26.2) | 470 | 21.1 (18.3–23.9) | 518 | 26.1 (19.9–32.2) | 456 | 20.1 (13.2–27.0) | 482 | 22.4 (16.7–28.1) | 446 | 22.0 (18.0–25.9) |
| Clinical malariaa | ||||||||||||
| All ages | 985 | 14.4 (11.9–17.0) | 897 | 15.2 (11.1–19.2) | 1016 | 15.6 (12.5–18.6) | 896 | 12.6 (10.4–14.8) | 907 | 11.4 (8.8–13.9) | 841 | 10.7 (8.4–13.0) |
| <5 y | 151 | 22.5 (13.5–31.5) | 152 | 21.1 (9.6–32.5) | 140 | 15.0 (8.6–21.4) | 141 | 14.2 (9.2–19.2) | 136 | 20.6 (14.4–26.8) | 117 | 18.8 (11.8–25.8) |
| 5–14 y | 313 | 20.4 (16.4–24.5) | 284 | 22.9 (13.0–32.7) | 358 | 22.1 (15.2–29.0) | 303 | 18.2 (14.7–21.6) | 289 | 12.8 (9.5–16.1) | 278 | 13.3 (9.5–17.1) |
| ≥15 y | 521 | 8.4 (5.8–11.1) | 461 | 8.5 (7.2–9.8) | 518 | 11.2 (5.1–17.3) | 452 | 8.4 (4.6–12.2) | 482 | 7.9 (5.0–10.7) | 446 | 7.0 (4.7–9.2) |
| Clinical malaria among those infected | ||||||||||||
| All ages | 364 | 39.0 (34.9–43.0) | 302 | 45.0 (34.9–55.2) | 400 | 39.5 (34.5–44.5) | 285 | 39.6 (31.6–47.7) | 327 | 31.5 (26.3–36.7) | 251 | 35.9 (31.1–40.6) |
| <5 y | 66 | 51.5 (33.0–70.0) | 48 | 66.7 (51.1–82.2) | 46 | 45.7 (30.9–60.4) | 44 | 45.5 (30.3–60.6) | 53 | 52.8 (37.8–67.9) | 34 | 64.7 (47.6–81.8) |
| 5–14 y | 183 | 35.0 (28.1–41.8) | 158 | 41.1 (26.3–56.0) | 219 | 36.1 (27.3–44.8) | 150 | 36.7 (27.3–46.0) | 166 | 22.3 (16.4–28.2) | 119 | 31.1 (23.9–38.3) |
| ≥15 y | 115 | 38.3 (28.6–47.9) | 96 | 40.6 (32.0–49.3) | 135 | 43.0 (27.1–58.8) | 91 | 41.8 (29.1–54.4) | 108 | 35.2 (25.5–44.6) | 98 | 31.6 (22.0–41.3) |
Parasite densities were log-transformed and are expressed as parasites per microliter. Values in parentheses represent 95% confidence intervals.
a
Clinical malaria is defined as individuals with a positive blood smear who reported a fever within the previous 2 weeks