Doran 1975.

Methods	RCT
Participants	Subjects: 456 patients with non‐specific LBP; 211 women, 245 men. Age 20‐50, duration of symptoms: less than a week to more than 6 months. Inclusion criteria: 1) age 20‐50 years, 2) painful limitation of movement in the lumbar spine and 3) suitable for any treatment.
Interventions	Treatment interventions: 1) Corset (= 109), any type, 3 weeks. No data on number of hours/day. Control interventions: 2) Manipulation (n= 116), 2 treatments/ wk 3) Physiotherapy (n= 114), any treatment except manipulation, 2 treatments/wk 4) Analgesic tablets (n=113) 2 paracetamol / 4 hours.
Outcomes	Pain, overall assessment by the doctor. No significant differences after 3 and 6 weeks, and 3 and 12 months.
Notes	456 patients entered the trial. At baseline 452 patients were assessed. After 3 weeks 395 patients were assessed, after 6 weeks 340, after 3 month 335 and after 12 month 262 patients were assessed. No data available regarding compliance.
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Unclear risk	Unclear from text
Allocation concealment?	Unclear risk	B ‐ Unclear
Blinding? All outcomes ‐ patients?	High risk
Blinding? All outcomes ‐ outcome assessor?	Low risk
Incomplete outcome data addressed? All outcomes ‐ drop‐outs?	High risk
Incomplete outcome data addressed? All outcomes ‐ ITT analysis?	High risk
Similarity of baseline characteristics?	Unclear risk	Unclear from text
Co‐interventions avoided or similar?	Unclear risk	Unclear from text
Compliance acceptable?	High risk
Timing outcome assessments similar?	Low risk