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Effect of probiotic and placebo supplementation on CFU of bacterial groups tested (probiotic, n = 26; placebo, n = 32). The empty and filled bars represent the placebo and the probiotic groups, respectively. The error bars represent the standard errors of the means. P values are as follows: 0.005, total bacteria; 0.02, total aerobic bacteria; 0.008, total anaerobic bacteria; 0.002, bifidobacteria; 0.015, Enterobacteriaceae; 0.014, clostridia. *, P < 0.05; **, P < 0.01.
