Roelofs 2007.

Methods	RCT
Participants	Subjects: 360 home workers with non‐specific LBP or two or more episodes of LBP in past 12 moths; 352 female, 8 male. Mean age 41.7 years.
Interventions	Preventive intervention: 1) lumbar support and usual care (n=183), lumbar support use on those working days they expected LBP, for 12 months. Control intervention: 2) usual care
Outcomes	Severity of LBP, Number of days LBP, functional status, sick leave rates after one year. The intervention group had less of LBP, better functional status and significant less number days of LBP. No differences in sick‐leave.
Notes	78% wore the lumbar support at least on third of the total days LBP
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Low risk
Allocation concealment?	Low risk	A ‐ Adequate
Blinding? All outcomes ‐ patients?	High 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?	Low risk
Co‐interventions avoided or similar?	Unclear risk	Unclear from text
Compliance acceptable?	Low risk	78% wore the lumbar support at least on third of the total days LBP
Timing outcome assessments similar?	Low risk