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. 2020 Aug 24;103(4):1405–1415. doi: 10.4269/ajtmh.20-0228

Table 3.

Intervention effects on 7-day prevalence of diarrhea at quarterly follow-up visits for 24 months among 388 children

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.