Abstract
OBJECTIVE:To examine the test-retest reliability, construct validity and factor structure of the Pain Beliefs and Perceptions Inventory (PBPI).DESIGN:A sample of 195 individuals attending a chronic pain clinic completed the PBPI along with a preclinic assessment battery. A subset of this sample completed the assessment package two to four weeks and four to six months later in order to examine the test-retest reliability of the PBPI.RESULTS:Confirmatory factor analysis revealed a four-factor solution: pain constancy, self-blame, mystery and understanding of chronicity. Internal consistency estimates ranged from 0.63 to 0.75. Pain constancy and understanding of chronicity had good test-retest reliability, while test-retest reliability of the remaining subscales was not adequate. These results differ from those reported in the initial development of the PBPI. Construct validity was determined through examination of correlations between the PBPI and the Beck Depression Inventory, the McGill Pain Questionnaire, the Multidimensional Pain Inventory and a self-blame questionnaire.CONCLUSIONS:The results of this investigation are consistent with the findings of recent investigations that revealed a four-factor solution to the PBPI. However, the subscales of this instrument were not found to be uniformly stable over time. These results suggest that further examination and refinement of item content for two of the subscales are required before the instrument is suitable for clinical use.
Highlights
Pain Beliefs and Perceptions Inventory package consisting of the PBPI, MBQ and BDI
Confirmatory factor analysis As shown in Table 2, the fit of the hypothesized model was satisfactory from a practical perspective, Comparative Fit Index (CFI)=0.90; it was not acceptable from a statistical perspective, c 2 (102, n=195) = 166.55, P
Results of this study support recent work indicating that the PBPI comprises four factors [7,8,9]
Summary
To examine the test-retest reliability, construct validity and factor structure of the Pain Beliefs and Perceptions Inventory (PBPI). Pain constancy and understanding of chronicity had good testretest reliability, while test-retest reliability of the remaining subscales was not adequate These results differ from those reported in the initial development of the PBPI. Three recent investigations examining the factor structure of the PBPI [7,8,9] reported a four-factor solution In these studies, the TIME subscale emerged as two separate factors: acceptance (or pain permanence [9]) and constancy. Pain Beliefs and Perceptions Inventory package consisting of the PBPI, MBQ and BDI These questionnaires were completed a final time at the clinic visit, approximately four to six months following the initial administration.
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