Reliability and responsiveness of measures of pain in people with osteoarthritis of the knee: a psychometric evaluation

Turner, Katie V. and Moreton, Bryan M. and Walsh, David A. and Lincoln, Nadina (2017) Reliability and responsiveness of measures of pain in people with osteoarthritis of the knee: a psychometric evaluation. Disability and Rehabilitation, 39 (8). pp. 822-829. ISSN 0963-8288

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Abstract

PURPOSE: To examine the fit between data from the Short Form McGill Pain Questionnaire (SF-MPQ-2) and the Rasch model, and to explore the reliability and internal responsiveness of measures of pain in people with knee osteoarthritis.

METHODS: Participants with knee osteoarthritis completed the SF-MPQ-2, Intermittent and Constant Osteoarthritis Pain questionnaire (ICOAP) and painDETECT. Participants were sent the same questionnaires 3 and 6 months later.

RESULTS: Fit to the Rasch model was not achieved for the SF-MPQ-2 Total scale. The Continuous subscale yielded adequate fit statistics after splitting item 10 on uniform DIF for gender, and removing item 9. The Intermittent subscale fit the Rasch model after rescoring items. The Neuropathic subscale had relatively good fit to the model. Test-retest reliability was satisfactory for most scales using both original and Rasch scoring ranging from fair to substantial. Effect sizes ranged from 0.13 to 1.79 indicating good internal responsiveness for most scales.

CONCLUSIONS: These findings support the use of ICOAP subscales as reliable and responsive measure of pain in people with knee osteoarthritis. The MPQ-SF-2 subscales found to be acceptable alternatives. Implications for Rehabilitation The McGill Pain Questionnaire short version 2 is not a unidimensional scale in people with knee osteoarthritis, whereas three of the subscales are unidimensional. The McGill Pain Questionnaire short version 2 Affective subscale does not have good measurement properties for people with knee osteoarthritis. The McGill Pain Questionnaire short version 2 and the Intermittent and Constant Osteoarthritis Pain scales can be used to assess change over time. The painDETECT performs better as a screening measure than as an outcome measure.

Item Type: Article
Keywords: ICOAP, McGill pain questionnaire, Rasch, test–retest
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine > Division of Rehabilitation and Ageing
Identification Number: 10.3109/09638288.2016.1161840
Depositing User: Dziunka, Patricia
Date Deposited: 14 Mar 2017 11:28
Last Modified: 28 Apr 2017 10:53
URI: http://eprints.nottingham.ac.uk/id/eprint/41258

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