Aller 2004.

Methods	RCT
Participants	56 patients Rome II criteria 53% diarrhea‐predominant Setting unclear Mean age 46 years 67% female
Interventions	Bulking agent 30 g fibre of which 25 g insoluble, over the day for 13 weeks
Outcomes	Abdominal pain, continuous Symptom score, continuous
Notes	Half a week run‐in
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not described
Allocation concealment (selection bias)	Unclear risk	Not described
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Single‐blind ‐ not described in detail
Incomplete outcome data (attrition bias) All outcomes	Low risk	No patients dropped out of the study
Selective reporting (reporting bias)	Low risk	All expected outcomes were reported
Other bias	Low risk	The study appears to be free of other sources of bias