Table 4. Summary of S. haematobium infection for years 1 and 5 by study arm (first-year students and adults).
| Year | Arm | First year students (5-8-years) | Adults (20-55-years) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Number tested | Number infected (%) | Heavily infected (%) | Mean infection intensity | Number tested | Number infected (%) | Heavily infected (%) | Mean infection intensity | ||
| 1 | 1 | 1,419 | 846 (59.6) | 239 (16.8) | 50.0 | 735 | 351 (47.8) | 64 (8.7) | 25.5 |
| 2 | 1,148 | 751 (65.4) | 239 (20.8) | 66.1 | 615 | 328 (53.3) | 60 (9.8) | 33.5 | |
| 3 | 1,465 | 913 (62.3) | 291 (19.9) | 68.0 | 890 | 367 (41.2) | 51 (5.1) | 23.2 | |
| 4 | 1,296 | 765 (59.0) | 189 (14.6) | 42.0 | 652 | 210 (32.2) | 33 (5.1) | 16.6 | |
| 5 | 1,191 | 823 (69.1) | 247 (20.7) | 64.2 | 703 | 373 (53.1) | 59 (8.4) | 29.3 | |
| 6 | 937 | 586 (62.5) | 234 (25) | 59.3 | 658 | 265 (40.3) | 33 (5.0) | 15.2 | |
| Total | 7,456 | 4,684 (62.8) | 1,439 (19.3) | 58.1 | 4,253 | 1,894 (44.5) | 300 (7.1) | 23.9 | |
| 5 | 1 | 2,251 | 808 (35.9) | 262 (11.6) | 46.6 | 1,151 | 247 (21.5) | 49 (4.3) | 20.2 |
| 2 | 2,282 | 785 (34.4) | 215 (9.4) | 41.5 | 1,008 | 230 (22.8) | 43 (4.3) | 14.4 | |
| 3 | 2,069 | 893 (43.2) | 337 (16.3) | 84.8 | 1,181 | 287 (24.3) | 64 (5.4) | 27.8 | |
| 4 | 2,320 | 845 (36.4) | 287 (12.4) | 63.3 | 1,085 | 311 (28.7) | 93 (8.6) | 40.6 | |
| 5 | 2,205 | 1,085 (49.2) | 369 (16.7) | 77.5 | 1,084 | 357 (32.9) | 71 (6.5) | 34.1 | |
| 6 | 2,117 | 784 (37.0) | 224 (10.6) | 60.0 | 1,080 | 308 (28.5) | 50 (4.6) | 21.5 | |
| Total | 13,244 | 5,200 (39.3) | 1,694 (12.8) | 61.8 | 6,589 | 1,740 (26.4) | 370 (5.6) | 26.5 | |
| Absolute difference in prevalence? | -23.5 | -18.1 | |||||||
| Relative difference in prevalence? | -37.4 | -40.7 | |||||||