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Forest plot of the SMDs with 95% CIs for probiotic studies. No summary SMD is calculated owing to heterogeneity and the small number of studies. HAZ, height-for-age z score; nc, number of children in the control group; ne, number of children in the experimental probiotic group; SMD, standardized mean difference; WAZ, weight-for-age z score; WHZ, weight-for-height z score.
