Musculoskeletal pain illness perceptions: Factor structure of the Illness Perceptions Questionnaire-Revised.
ABSTRACT Background: The Revised Illness Perceptions Questionnaire (IPQ-R) is commonly used to measure illness perceptions. We tested whether the structure of the IPQ-R was appropriate for use with primary care musculoskeletal pain patients. Methods: Confirmatory (C) and exploratory (E) factor analyses (FA) were used to test whether the structure of the IPQ-R was supported for patients with knee pain (n = 393), hand pain (n = 2113) and back pain (n = 1591). CFA was used to test whether the timeline acute/chronic, timeline cyclical, consequences, personal control, treatment control, illness coherence and emotional representation dimensions of the IPQ-R were distinct; EFA was used to explore potential structure for patients' views on the cause of their condition. Results: Goodness-of-fit indices for the CFA were below our criteria for good model fit. Removal of six items from the model improved model fit, but our criteria for good model fit was still not achieved. An interpretable factor solution could not be determined for the causal items on the questionnaire. Conclusions: Our data show limited evidence that the seven dimensions of the IPQ-R are distinct. A clear structure for the causal items was not determined. Further work is needed to develop the IPQ-R for use with primary care musculoskeletal pain patients.
Article: Using the self-regulatory model to cluster chronic pain patients: the first step towards identifying relevant treatments?[show abstract] [hide abstract]
ABSTRACT: The pain literature indicates that, despite extensive investigations and recommendations, treatment outcomes can be poor. This study assesses whether a theoretical approach using the self-regulatory model (SRM) could usefully categorise chronic pain patients on the basis of their illness representations, since these have been shown to influence outcomes for other health-related conditions. One hundred and thirty newly referred patients of a pain relief clinic completed the revised Illness Perceptions Questionnaire and other measures. Cluster analysis supported the utility of a theoretical model of illness representations to identify pain groups, with the groups so identified differing in measures of pain, mood, and functioning. This study can be viewed as a preliminary step for future research employing stronger design methodologies to explore the validity of the SRM for classifying chronic pain patients, and to compare efficacy of treatment choice and outcome for this population based on illness representations.Pain 05/2004; 108(3):276-83. · 5.78 Impact Factor