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The measurement of psychological constructs in people with osteoarthritis of the knee: a psychometric evaluation.

Abstract：

:Purpose To examine the measurement properties of measures of psychological constructs in people with knee osteoarthritis. Method Participants with osteoarthritis of the knee completed the beck depression inventory (BDI-II), state-trait anxiety inventory (STAI), arthritis helplessness index (AHI), fatigue severity scale (FSS), coping strategies questionnaire (CSQ), beliefs about pain control questionnaire (BPCQ), illness perceptions questionnaire-revised (IPQ-R), pain self-efficacy questionnaire (PSEQ) at home as part of a set of measures covering different aspects of osteoarthritis pain. The questionnaires were returned by pre-paid envelope. Rasch analysis was used to check the psychometric properties of the scales in people with osteoarthritis. Results The STAI-SF was an acceptable measure of anxiety and the revised FSS an acceptable measure of fatigue, with removal of items 1 and 2. The BDI subscales were acceptable for measuring negative thoughts and behaviours related to depressive symptomatology with some modifications to the scale. The helplessness scale of the AHI was acceptable as a measure of helplessness. The PSEQ was an acceptable measure of self-efficacy and the CSQ as a measure of cognitive coping strategies. The BPCQ and IPQ-R did not fit the Rasch model. Conclusions These findings indicate that questionnaires need to be checked for their ability to measure psychological constructs in the clinical groups to which they will be applied. Implications for Rehabilitation For people with osteoarthritis, the STAI-SF is an acceptable measure of anxiety and the revised FSS an acceptable measure of fatigue with removal of items 1 and 2. The BDI subscales, but not the total score, are acceptable for measuring depressive symptomatology with some modifications to the scoring of the scale. And helplessness can be measured using the Helplessness subscale of the AHI. The PSEQ was an acceptable measure of self-efficacy and cognitive coping strategies can be measured with the CSQ. Rasch analysis highlighted lack of unidimensionality, disordered response thresholds and poor targeting in some measures commonly used for people with osteoarthritis.

journal_name

Disabil Rehabil

journal_title

Disability and rehabilitation

authors

Lincoln N,Moreton B,Turner K,Walsh D

doi

10.3109/09638288.2016.1146356

subject

Has Abstract

pub_date

2017-02-01 00:00:00

pages

372-384

issue

eissn

0963-8288

issn

1464-5165

journal_volume

pub_type

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The measurement of psychological constructs in people with osteoarthritis of the knee: a psychometric evaluation.