Abstract
Background
For several widely‐used patient‐reported outcome measures (PROMs) in chronic musculoskeletal pain (CMSP) rehabilitation, it is still not known whether they are responsive to change, and what the smallest detectable change (SDC) and minimal clinically important change (MCIC) are. Knowledge of these values can be used to accurately interpret change scores in research and clinical practice.
Methods
In this retrospective cohort study, the responsiveness, the SDC, and the MCIC of the mental components of the Research and Development 36‐Item Health Survey (RAND‐36), the Pain Catastrophizing Scale (PCS), and the Tampa Scale of Kinesiophobia (TSK) were investigated in CMSP patients. Responsiveness, the SDC, and MCIC were determined by using both anchor and distribution‐based methods.
Results
For all outcome measures, there was a progression from smallest to largest mean change scores between participants who did not perceive change and those who reported change after treatment. However, correlations of the Global Perceived Effect (GPE) with the change scores on the outcome measures were low. For all outcome measures, the SDC was larger than the MCIC.
Conclusions
For this population, the questionnaires were shown not to be responsive. Furthermore, the questionnaires appeared not to be able to distinguish clinically important change from measurement error in individual patients. The finding of large measurement errors of PROMs is in line with previous research in pain rehabilitation. Using generic PROM s only, to examine changes in psychosocial status due to a pain rehabilitation programme, is therefore questionable.
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