Table 3.
Intervention | Intention-to-treat analysis | As-treated analysis | ||||
---|---|---|---|---|---|---|
Number of follow-up visits | Diarrhea in the past 7 days, n (%) | Prevalence ratio* (95% CI) | Number of follow-up visits | Diarrhea in the past 7 days, n (%) | Prevalence ratio* (95% CI) | |
Filter | 643 | 46 (7.2) | 1.17 (0.70, 1.96) | 490 | 39 (8.1) | 1.14 (0.67, 1.94) |
No silver filter | – | – | – | 467 | 18 (3.9) | 1.09 (0.52, 2.30) |
Ceramic tablet | 634 | 41 (6.5) | 1.07 (0.61, 1.88) | 320 | 30 (9.4) | 1.23 (0.69, 2.21) |
Safe storage | 688 | 46 (6.7) | 1.13 (0.69, 1.84) | 688 | 46 (6.7) | 1.13 (0.69, 1.84) |
No intervention | 598 | 36 (6.1) | 1. | 598 | 36 (6.1) | 1. |
Combined intervention† | 1,277 | 87 (6.9) | 1.05 (0.73, 1.50) | 810 | 69 (8.5) | 1.10 (0.75, 1.61) |
Combined control | 1,286 | 82 (6.4) | 1. | 1,286 | 82 (6.4) | 1. |
* Adjusted for age using cubic splines with 4 knots.
For as-treated analysis, excludes the no silver filter group.