Fig. 3From: Effect of prebiotics, probiotics, synbiotics on depression: results from a meta-analysisThe outcomes of subgroup analysis. a based on the severity of depression, b based on whether the percentage of females in the study population was more or less than 70%, c based on different types of interventional agents, including prebiotics or agents containing probiotics (i.e., probiotics and synbiotics), d based on single or multiple strains of probioticsBack to article page