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Effect of interventions on the mean prevalence of Escherichia coli contamination of stored drinking water in Pisco, Peru, 2014
| Study arm | Observation days | Observation days with E. coli contamination (%) | Risk difference relative to control | PR | (95% CI) |
|---|---|---|---|---|---|
| Control | 338 | 126 (37·3) | Ref | 1·00 | (Ref.) |
| Container only | 355 | 136 (38·3) | 1·0 | 1·02 | (0·79–1·31) |
| Container and indicator | 346 | 153 (44·2) | 6·9 | 1·18 | (0·92–1·52) |
PR, Prevalence ratio; CI, confidence interval.
