Lindell 2008.

Methods	RCT; 2 arms; assessed at pre‐treatment, post‐treatment, 18‐month follow‐up
Participants	End of treatment n = 123 Start of treatment n = 125 Sex: 68 F, 57 M Mean age =  42.6 (SD not given) Source = primary care Diagnosis = non‐specific back or neck pain Mean years of pain = not given but had to be sick listed for more than 6 weeks up to 2 years; mean over 7 months sick listed
Interventions	"Cognitive‐behavioural rehabilitation" "Primary care"
Outcomes	Primary pain outcome: none Primary disability outcome: none Primary mood outcome: none Catastrophising outcome: none 1. Sick listed days 2. Healthcare visits
Notes	December 2009 search No data available Yates quality scale: total quality = 18/35, design quality = 16/26, treatment quality = 2/6
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computerised block randomisation procedure
Allocation concealment (selection bias)	Low risk	Randomisation generated by independent statistician; in opaque envelopes
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Fully reported; no test for differences
Selective reporting (reporting bias)	Low risk	Fully reported
Blinding of outcome assessment (detection bias) All outcomes	High risk	Assessors not blind to treatment condition, except for sick listing outcome