Gulewitsch 2013.

Methods	RCT with wait‐list control Follow‐up: postintervention (2 weeks) follow‐up
Participants	Location: Germany Setting: recruited from community and outpatient clinics Sample size: 38 children (20 intervention, 18 control) Sex: 14 boys, 24 girls Dropouts/withdrawals: 0 Diagnosis: FAP and IBS according to Rome III (Rasquin 2006) Mean age: intervention: 9.1 (SD 1.7; range not reported) years; control: 9.7 (SD 1.8; range not reported) years. Data not reported for groups overall.
Interventions	Intervention: brief hypnotherapeutic behavioural intervention (group format), 90 minutes/week x 4 (2 child focused, 2 parent focused) with homework for children to practice hypnotherapeutic trances at home, 5 times a week Control: wait‐list control (no further details reported)
Outcomes	Number of days with pain (pain diary) Pain index (Abdominal Pain Index; Walker 1997) Pain intensity and duration (1 to 10 scale) Health‐related quality of life (KINDL‐R in German; Ravens‐Sieberer 1998) Treatment success (> 80% reduction in Abdominal Pain Index; Walker 1997) Pain disability (P‐PDI; Hübner 2009)
Notes	Study dates: not reported Funding: none stated Declarations of interest: authors report no conflicts of interest
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Comment: computerised random number generator
Allocation concealment (selection bias)	Unclear risk	Comment: not reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	Comment: aware of treatment and issues re: wait‐list expectancy
Blinding of outcome assessment (detection bias) All outcomes	High risk	Comment: self report
Incomplete outcome data (attrition bias) All outcomes	Low risk	Comment: all participants accounted for
Selective reporting (reporting bias)	Low risk	Comment: all outcomes reported
Other bias	Low risk	Comment: well reported