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Reduction of diarrhea duration (days) in six included studies that reported mean reduction and variance using the fixed-effects method: 0.8-d reduction in diarrhea (95% CI: 0.74 to 0.87 d). Box size is proportional to the inverse magnitude of the study variance. Random-effects reduction in diarrhea duration: 0.56 d (95% CI: 0.16 to 0.95 d). Test for heterogeneity, p < 0.001.
