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OBJECTIVES To demonstrate the use of Rasch analysis by assessing the appropriateness of utilizing the Hospital Anxiety and Depression Scale (HADS) total score (HADS-14) as a measure of psychological distress. DESIGN Cross-sectional, using Rasch analysis. METHODS The HADS was administered to 296 patients attending an out-patient musculoskeletal(More)
BACKGROUND Although disease-specific health status measures are available for ankylosing spondylitis (AS), no instrument exists for assessing quality of life (QoL) in the condition. OBJECTIVE To produce an AS-specific QoL measure that would be relevant and acceptable to respondents, valid, and reliable. METHODS The ASQoL employs the needs-based model of(More)
BACKGROUND The Warwick-Edinburgh Mental Well-Being Scale (WEMWBS) was developed to meet demand for instruments to measure mental well-being. It comprises 14 positively phrased Likert-style items and fulfils classic criteria for scale development. We report here the internal construct validity of WEMWBS from the perspective of the Rasch measurement model. (More)
OBJECTIVES To explore the concept of work instability (WI), a state in which the consequences of a mismatch between an individual's functional abilities and the demands of his or her job could threaten continuing employment if not resolved, in people with rheumatoid arthritis (RA). To develop the Work Instability Scale (WIS). METHODS WI in people with RA(More)
OBJECTIVE To develop a new foot impact scale to assess foot status in rheumatoid arthritis (RA) using established qualitative methodology and the latest item response techniques (Rasch analysis). METHODS Foot problems in RA were explored by conducting qualitative interviews that were then used to generate items for a new foot impact scale. Further(More)
OBJECTIVES To develop a patient-completed disease-specific measure of quality of life in multiple sclerosis and to validate the measure in a community-based population of people with multiple sclerosis. METHODS The items in the scale were selected in focus group sessions of people with multiple sclerosis. The initial scale included 25 items and was tested(More)
OBJECTIVE Guidelines have been established for cross-cultural adaptation of outcome measures. However, invariance across cultures must also be demonstrated through analysis of Differential Item Functioning (DIF). This is tested in the context of a Turkish adaptation of the Health Assessment Questionnaire (HAQ). METHODS Internal construct validity of the(More)
INTRODUCTION In Europe it is common for outcome measures to be translated for use in other languages. This adaptation may be complicated by culturally specific approaches to certain tasks; for example, bathing. In this context the issue of cross-cultural validity becomes paramount. OBJECTIVE To facilitate the pooling of data in international studies, a(More)
The objective of this study is to test the reliability and validity of WHODAS-II (Turkish version) for the assessment of disability in patients with osteoarthritis. This study is designed as follows: the internal construct validity of WHODAS-II in patients with knee osteoarthritis was assessed by Rasch analysis, and external construct validity by(More)