Treatment expectancy and credibility are associated with the outcome of both physical and cognitive-behavioral treatment in chronic low back pain

The Clinical Journal of Pain
Rob J E M SmeetsJohan W S Vlaeyen

Abstract

Patients' initial beliefs about the success of a given pain treatment are shown to affect final treatment outcome. The Credibility/Expectancy Questionnaire (CEQ) has recently been developed as measure of treatment credibility and expectancy. The objectives of this study were (1) to investigate the factor structure of the CEQ in a sample of chronic low back pain (CLBP) patients by means of a confirmatory factor analysis, (2) to examine the association between treatment credibility and expectancy and patient characteristics, and (3) to assess whether treatment expectancy and credibility are associated with the outcome of rehabilitation treatment. CLBP patients (n=167) were randomized to either active physical therapy (n=51), cognitive-behavioral therapy (n=57), or a combination therapy (n=59), and completed the CEQ after a careful explanation of the treatment rationale. Confirmatory factor analysis supported the 2-factor structure (credibility/expectancy) of the CEQ. Lower credibility was associated with higher pain-related fear and lower internal control of pain, and lower expectancy with higher levels of pain-related fear and no radiating pain. Multiple linear regression analyses revealed that after controlling for age, sex, tr...Continue Reading

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