Mitchell 1994.

Methods	RCT conducted in Canada
Participants	Workers on Worker's Compensation Board list referred to 2 work rehabilitation clinics. Injured workers who had not recovered and returned to work after 3 months, with inappropriate illness behaviour. 542 patients randomised, 28.5% female, average age not reported, mean duration of pain not reported
Interventions	MBR (FR): 8 weeks, 7 hours/day, 5 days/week (total 280 hours), group sessions (n=10‐12). Physical exercise; mobility, strengthening, flexibility, endurance, stretching, ice, circuit training, work simulation exercises (lifting). Behavioural and cognitive treatment, correction of unhelpful beliefs, education, relaxation, biofeedback, personal responsibility Usual (Control): Usual care, variable including; physio, medication, manipulation, acupuncture, work hardening, back schools, active exercise
Outcomes	Work (% full‐time work, days of sick leave) Follow‐ups: LT (1 year)
Notes	Subgroup analyses: High intensity intervention, Baseline symptom intensity unclear. Included in Guzman 2006
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Unclear
Allocation concealment (selection bias)	Unclear risk	Unclear
Blinding of participants	High risk	Not possible
Blinding of clinicians	High risk	Not possible
Blinding of outcome assessment (detection bias) All outcomes	High risk	Not possible; patient reported outcome
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Unclear
Intention to treat analysis	Unclear risk	Not stated
Selective reporting (reporting bias)	Unclear risk	No protocol
Comparability of groups at baseline	Unclear risk	Not reported
Compliance	Unclear risk	Not stated
Cointerventions	Unclear risk	Not stated
Timing of assessment	Low risk	pg. 635 Results. 12‐month follow‐up