Comparison 1. Bulking agents: Abdominal pain.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Comparing nr(%) of successfully treated IBS patients	1	80	Risk Ratio (M‐H, Fixed, 95% CI)	0.91 [0.61, 1.36]
1.1 Insoluble fibres	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
1.2 Soluble fibres	1	80	Risk Ratio (M‐H, Fixed, 95% CI)	0.91 [0.61, 1.36]
2 Comparing scores on abdominal pain in IBS patients	4	186	Std. Mean Difference (IV, Fixed, 95% CI)	0.03 [‐0.34, 0.40]
2.1 Insoluble fibres	3	126	Std. Mean Difference (IV, Fixed, 95% CI)	0.0 [‐0.52, 0.52]
2.2 Soluble fibres	1	60	Std. Mean Difference (IV, Fixed, 95% CI)	0.06 [‐0.45, 0.57]