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Section Type: RESULTS

Text: Analyses of covariance with baseline values (pain or disability) as covariates showed that transcranial direct current stimulation was ineffective for the reduction of pain (difference between groups on visual analogue scale 1 mm (99 % confidence interval -8. 69 mm to 6. 3 mm ; P = 0. 68)) and disability (difference between groups 1 point (-1. 73 to 1. 98 ; P = 0. 86)) and did not influence the outcome of cognitive behavioural management (difference between group 3 mm (-10. 32 mm to 6. 73 mm) ; P = 0. 58 ; difference between groups on Oswestry disability index 0 point (-2. 45 to 2. 62) ; P = 0. 92).