Schatz 2015.

Methods	RCT. Multicentrer. USA.
Participants	Display adherence, 1 major or 3 minor pain episodes in last 6 months, no chronic transfusion, no cognitive limitations.
Interventions	Intervention: CBT. Control: routine care.
Outcomes	1 face‐to‐face session, 45 – 60 min; weekly telephone session: 30 – 40 min. Materials on cell phone to take home; follow up 8 weeks.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Drawing coloured marbles out of opaque bag or computer software using blocks of 10.
Allocation concealment (selection bias)	Low risk	Researcher not involved in the trial prepared sequentially numbered opaque sealed envelopes.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Insufficient information to permit judgement of ‘low risk’ or ‘high risk’.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Insufficient information to permit judgement of ‘low risk’ or ‘high risk’.
Incomplete outcome data (attrition bias) All outcomes	Low risk	4% not completed.
Selective reporting (reporting bias)	Low risk	All outcomes reported.
Other bias	Unclear risk	No other bias anticipated, but insufficient information to permit judgement of ‘low risk’ or ‘high risk’.