Thorsell 2011.

Methods	RCT; 2 arms; self help acceptance and commitment therapy, self help applied relaxation; post‐treatment: 6‐month and 12‐month follow‐up
Participants	End of treatment: n = 64 Start of treatment: n = 98 Sex: 63 F; 35 M Source = pain clinic Diagnosis = mixed chronic pain Mean age: 46.0 (SD 12.3) Mean years of pain: not given (98% more than 1 year)
Interventions	Self help acceptance and commitment therapy; self help applied relaxation
Outcomes	Primary pain outcome: pain intensity 0 to 10 Primary disability outcome: OMPQ 5 items Primary mood outcome: Depression HADS Catastrophising outcome: none Pain intensity 0 to 10 Function: 5 items 0 to 10 from Orebro Musculoskeletal Pain Questionnaire (reverse direction) Depression HADS Anxiety HADS Satisfaction With Life Scale Chronic Pain Acceptance Questionnaire
Notes	ACT versus active control: analyses 1.1, 1.2, 1.3, 2.1, 2.2, 2.3 2011 update search Yates quality scale: total quality 18/35, design quality 13/26, treatment quality 5/9
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	“randomized by drawing pieces of paper with type of intervention”
Allocation concealment (selection bias)	High risk	Not reported, but treatment credibility equal
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Attrition fully reported; no test for differences
Selective reporting (reporting bias)	Low risk	Fully reported
Blinding of outcome assessment (detection bias) All outcomes	High risk	Not reported