Table 1.
Baseline (year 1), year 3, and year 5 characteristics of participants, and loss to follow-up, by arm
| Treatment arm* | Year 1 (baseline), N = 572 | Year 3, N = 459 | Year 5, N = 374 | Baseline characteristics of children lost to follow-up at year 5, N = 198 | ||||
|---|---|---|---|---|---|---|---|---|
| CWT arm | SBT arm | CWT arm | SBT arm | CWT arm | SBT arm | CWT arm | SBT arm | |
| Number of villages | 3 | 4 | 3 | 4 | 3 | 4 | 3 | 4 |
| Number in cohort | 254 | 318 | 196 | 263 | 153 | 221 | 101 | 97 |
| % Female (n) | 57.9 (147) | 51.3 (163) | 58.7 (115) | 51.7 (136) | 60.1 (92) | 52.5 (116) | 54.5 (55) | 48.5 (47) |
| Mean age (SD) | 7.3 (0.5) | 7.5 (0.5) | 9.6 (0.5) | 9.7 (0.5) | 11.3 (0.5) | 11.6 (0.5) | 7.3 (0.5) | 7.6 (0.5) |
| Number tested for schistosomiasis | 254 | 318 | 196 | 263 | 153 | 221 | 101 | 97 |
| Number infected | 175 | 161 | 62 | 87 | 56 | 97 | 68 | 42 |
| Mean prevalence, % (SD)† | 66.6 (31.8) | 52.0 (28.0) | 29.5 (17.1) | 33.6 (20.0) | 35.3 (18.8) | 46.5 (39.1) | 67.9 (29.5) | 47.0 (28.0) |
| Village-level arithmetic mean infection intensity, epg (SD)‡ | 130.7 (99.3) | 116.9 (185.0) | 13.8 (12.9) | 16.1 (21.1) | 17.5 (15.7) | 25.2 (29.0) | 118.3 (94.6) | 158.3 (265.6) |
| Individual-level arithmetic mean infection intensity, epg (SD)§ | 167.8 (99.1) | 152.8 (180.8) | 41.5 (25.9) | 36.3 (26.5) | 44.9 (22.9) | 36.3 (30.3) | 155.2 (116.4) | 214.0 (275.4) |
* CWT arm = four times community-wide treatment; SBT arm = twice school-based treatment alternating with years without treatment.
† Means of the prevalence of individual village.
‡ Mean of the means of individual villages, all investigated children included.
§ Mean of the means of individual villages, only infected children included.