Statistical analysis
diarrhoea
Means and standard deviations were calculated for the quantitative variables, and frequencies and proportions were calculated for the qualitative variables. Qualitative variables were compared using the chi square test. The Shapiro–Wilk test was used to determine the distribution of the data. The Cochran–Mantel–Hansel statistical test was used to identify the intervening variables. Relative risk and 95% confidence intervals (CIs) were calculated for symptom persistence after the beginning of the treatment and improvement of diarrhoea during treatment. 