Comparison 1. Probiotics versus placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 Induction of remission	2	46	Risk Ratio (M‐H, Random, 95% CI)	1.06 [0.65, 1.71]
1.2 Adverse events leading to withdrawal	2	46	Risk Ratio (M‐H, Random, 95% CI)	2.55 [0.11, 58.60]