QUESTIONS: What is the effect of advice/education compared with placebo or no advice/education on pain and disability in people with non-specific spinal pain? To what extent do characteristics of the patients, trial or intervention modify the estimate of the treatment effects? DESIGN: A systematic review with meta-analyses of randomised controlled trials. PARTICIPANTS: Adults with non-specific back and/or neck pain with or without radiating leg/arm pain of any duration were included. Trials recruiting pregnant women or surgical patients in the immediate postoperative phase were ineligible. INTERVENTION: Advice or education. OUTCOME MEASURES: The primary outcomes were self-reported pain and disability, and the secondary outcome was adverse events. The following potential effect modifiers were examined: risk of bias, duration of pain, location of pain, intensity of intervention and mode of intervention. RESULTS: Twenty-seven trials involving 7,006 participants were included. Eighteen of the included trials were assessed as being at low risk of bias (>= 6 on the PEDro scale). There was low-quality evidence that advice had a small effect on pain (MD -8.2, 95% CI -12.5 to -3.9, n = 2,241) and moderate-quality evidence that advice had a small effect on disability (MD -4.5, 95% CI -7.9 to -1.0, n = 2,579) compared with no advice or placebo advice in the short-term. None of the items that were assessed modified the treatment effects. CONCLUSION: Advice provides short-term improvements in pain and disability in non-specific spinal pain, but the effects are small and may be insufficient as the sole treatment for patients with spinal pain. REGISTRATION: PROSPERO CRD42020162008.

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