Figure 2

Responder rate after treatment in placebo and Clostridium butyricum (CB) groups. The overall responder rate was higher in the CB group compared with that in the placebo group (P = 0.042). The responder rate of patients with moderate to severe symptoms in the CB group was significantly higher than that in the placebo group (P = 0.007). *P < 0.05, **P < 0.01.