Who benefits from multimodal rehabilitation - an exploration of pain, psychological distress, and life impacts in over 35,000 chronic pain patients identified in the Swedish Quality Registry for Pain Rehabilitation.

To handle possible regression toward the mean biases, we also checked these changes with ANCOVA using the baseline value as a covariate; the cluster differences remained clearly significant ( P <0.001) for the changes related to both time points for NRS-7d, pain severity, pain interference, and life control.

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Intercorrelations Bivariate intercorrelations Highly significant bivariate intercorrelations according to Pearson’s test exist between the pain variables and the psychological distress variables ( Table 4 ).

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