Richter 1986.

Study characteristics
Methods	RCT. 3 arms. Assessed at pretreatment, post‐treatment
Participants	End of treatment: n = 43 Start of treatment: n = 51 Sex: 34 F, 17 M Mean age = 12.9 years Source = referred by physicians to children's hospital Diagnosis = migraine Mean years of pain = not given: mostly over 2 years
Interventions	"Relaxation training" "Cognitive coping" "Attention control"
Outcomes	Primary pain outcome: headache diary Primary disability outcome: none Primary depression outcome: Child Depression Rating Scale Primary anxiety outcome: State Trait Anxiety Inventory Headache index (intensity, frequency, duration, medication taken: diary) State Trait Anxiety Inventory (STAI) or State‐Trait Anxiety Inventory for Children (STAI‐C) Children's Depression Rating Scale
Notes	COI: not reported Funding: "This research was supported by grants from the Ontario Ministry of Health and the Ontario Ministry of Community and Social Services."
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"... and randomly assigned to treatment" Comment: probably done, no method described
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	Low risk	"Over the course of treatment there were 8 drop‐outs. A chi‐square analysis comparing attrition rates across interventions was not significant." Comment: attrition adequately reported and no significant differences between completers and non‐completers reported
Selective reporting (reporting bias)	High risk	Data were incompletely reported