Fig. 1From: Development of gut microbiota along with its metabolites of preschool childrenThe alpha diversity of the gut flora in different groups. a Chao 1 index and b Shannon index indicated the richness and evenness of the species in each group, respectively. Kruskal-Wallis test was used to determine the difference among these 9 groups. *p < 0.05, **p < 0.01, ***p < 0.001Back to article page