Psychometric properties of the rehabilitation treatment beliefs questionnaire for psychosomatic rehabilitation

Purpose Treatment beliefs play a crucial role for patient satisfaction and the treatment outcome in psychosomatic rehabilitation. The aim of this study was the development and the psychometric evaluation of an indication-specific questionnaire of beliefs about psychosomatic rehabilitation.Materials and methods The study was conducted at a psychosomatic rehabilitation clinic. The primary item list comprised k = 125 items. After a descriptive item analysis, we conducted an exploratory factor analysis. Furthermore, we tested reliability via McDonald’s Omega and construct validity by analyzing correlations of the scales with related constructs.Results Of the N = 264 participants, 50% were female and the mean age was 50.4 (SD = 9.8) years. K = 85 items were suitable for factor analysis, which resulted in k = 30 items constituting six scales, explaining of 57% the overall variance. The corrected item-total correlations were between r = 0.48 and r = 0.83. Internal consistency ranged from ω = 0.81 to ω = 0.86.Conclusion The newly developed questionnaire assesses specific treatment beliefs about inpatient psychosomatic rehabilitation. The psychometric properties of the six scales are acceptable. Further studies should confirm the psychometric results, such as the factorial structure of the questionnaire.IMPLICATIONS FOR REHABILITATIONTreatment beliefs are known to play an important role for the adherence, therapy outcome and satisfaction in psychosomatic rehabilitation.We developed and tested a indication-specific questionnaire assessing treatment beliefs in psychosomatic rehabilitation.The questionnaire can be used to explore patient’s rehabilitation-related treatment beliefs, predict treatment outcomes, and to develop interventions attempting to modify these.