Million 1981.

Methods	RCT
Participants	Subjects: 19 patients, 13 women and 6 men. Mean age 47.1. Inclusion criteria: 1) over 18 years of age, 2) suffering from chronic non‐specific LBP > 6 months, 3) not responding to any form of treatment.
Interventions	Treatment intervention: 1) Corset and lumbar support (n=9). Support is of rigid material. Corset use during the day, 8 weeks. Control intervention: 2) Corset (n=10), lumbosacral corset use during the day, 8 weeks.
Outcomes	Subjective and objective index. Rigid support better subjective index after 4 and 8 weeks.
Notes	The subjective index is an overall measurement of the severity of symptoms and of the interference of these symptoms with normal activities. The objective index is an overall measurement of the straight leg raising and of spinal movements. No data on compliance.
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Low risk
Allocation concealment?	Low risk	A ‐ Adequate
Blinding? All outcomes ‐ patients?	Low risk
Blinding? All outcomes ‐ outcome assessor?	High risk
Incomplete outcome data addressed? All outcomes ‐ drop‐outs?	Low risk
Incomplete outcome data addressed? All outcomes ‐ ITT analysis?	Low risk
Similarity of baseline characteristics?	High risk
Co‐interventions avoided or similar?	High risk
Compliance acceptable?	High risk	No data on compliance.
Timing outcome assessments similar?	Low risk