Developing a Short Multidimensional Measure of Pain Self-efficacy: The Chronic Pain Self-efficacy Scale-Short Form.

Background And Objectives: The 22-item Chronic Pain Self-efficacy Scale (CPSS) measures three domains of pain self-efficacy: pain management, physical functioning, and coping with symptoms. This study aims to develop a short form (CPSS-SF) that retains the multidimensional structure of the instrument.

Research Design And Methods: Six hundred sixty-four community-dwelling Chinese older adults aged 60-95 years with chronic pain completed a survey. Confirmatory factor analysis (CFA) was conducted on the 22-item CPSS. Regression analyses were performed to examine the items' correlations with criterion variables. After CPSS-SF items were selected, the performance of CPSS-SF subscales in terms of accounting for pain-related outcomes was compared with the full version.

Results: CFA supported a modified 3-factor model of the CPSS. On the basis of factor loadings on the 3 dimensions and the items' correlations with pain intensity and pain disability, 11 items were selected for the CPSS-SF, which correlated at .97 with the full version. Regression analyses showed that the associations of the CPSS-SF subscales with pain intensity, pain disability, depressive symptoms, instrumental activities of daily living, and physical and mental health-related quality of life, were indistinguishable from their full-version counterparts.

Discussion And Implications: The CPSS-SF is a valid instrument that can be used in lieu of the full scale. Its availability will facilitate the assessment of pain self-efficacy in research and clinical settings due to its brevity but strong psychometric properties. However, the current evidence is limited to Chinese older adults; more research is needed to ascertain its validity in other age and cultural groups.