Robins 2005.

Study characteristics
Methods	RCT. 2 arms. Assessed at pretreatment, post‐treatment (3 months after start), 6 to 12 months
Participants	End of treatment: n = 69 Start of treatment: n = 86 Sex: 39 F, 30 M Mean age = 11.4 years (SD 2.4) Source = paediatric gastroenterology outpatient clinic of children's hospital Diagnosis = recurrent abdominal pain Mean years of pain = not stated
Interventions	"Short term cognitive behavioural family treatment plus standard medical care" "Standard medical care"
Outcomes	Primary pain outcome: Abdominal Pain Index Primary disability outcome: Functional Disability Inventory Primary depression outcome: none Primary anxiety outcome: none Abdominal Pain Index Child Somatization Inventory Functional Disability Inventory Abdominal Pain Index (parent) Child Somatization Inventory (parent)
Notes	COI: not reported. Funding: "This study was supported in part by a grant through the Nemours Research Programs, awarded to the first author."
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	"The remaining sample of 86 were randomly assigned using a coin‐flip method." Comment: probably done
Allocation concealment (selection bias)	Unclear risk	No description found in text Comment: probably not done
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No description found in text Comment: probably not done
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Attrition was described, however significant differences between completers and non‐completers were not described
Selective reporting (reporting bias)	High risk	Data were incompletely reported