Disease‐related differential item functioning in the work instability scale for rheumatoid arthritis: Converging results from three methods

Tang, Kenneth

doi:10.1002/acr.20491

Cited by 12 publications

(11 citation statements)

References 33 publications

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“…Scales containing such DIF items have reduced validity for between-group comparisons because their scores are influenced by a variety of attributes other than those intended [ 19 ]. To date, most attention has been given to investigations of DIF associated with age [ 20 , 22 ], sex [ 20 , 22 ], culture [ 23 ] or, disease [ 24 – 26 ], but few studies have examined disease’s severity-related DIF.…”

Section: Introductionmentioning

confidence: 99%

A psychometric assessment of the St. George’s respiratory questionnaire in patients with COPD using rasch model analysis

Liang

Hang

et al. 2015

Health Qual Life Outcomes

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BackgroundThe St. George’s Respiratory Questionnaire (SGRQ) was a widely used tool to assess disease impact on patients with obstructive airways disease. Although traditional methods have generally supported construct validity and internal consistency reliability of SGRQ, such methods cannot facilitate the evaluation of whether items are equivalent to different individuals. The purpose of this study is to rigorously examine the psychometric properties of the SGRQ in patients with chronic obstructive pulmonary disease (COPD) using Rasch model analysis.MethodsA methodological research was conducted on SGRQ in a sample of 240 male patients with COPD recruited from the outpatient services in Central Taiwan. The psychometric properties of the SGRQ were examined using Rasch model analysis with a mixed rating scale and partial credit mode by Winsteps software. The level of matching between the item’s difficulty and person’s ability was analyzed by item-person targeting as well as ceiling and floor effects. Item-person maps were also examined for checking the location of the item’s difficulty and person’s measures along the same scale. Finally, the differential item functioning (DIF) was examined to measure group equivalence associated with age and disease’s severity.ResultsEach of the three domains (Symptom, Activity, Impact) of the SGRQ was found to be unidimensionality. The person separation index ranged from 1.21 (Symptom domain) to 2.50 (Activity domain). There was a good targeting for the SGRQ domains, except the Impact domain (1.36). The percentage of ceiling and floor effects were below 10 %, except the ceiling effect in the Impact domain (26.25 %). From item-person maps, gaps of location of item corresponded to patient’s ability were identified. The results have also showed that many items in SGRQ revealed age or severity related DIF.ConclusionsExcept the Symptom domain of SGRQ, the others have a reliabile internal consistency and a good hierarchical structure. The results of Rasch model analysis can highlight aspects for scale improvement, such as gap, duplicate items or scale responses. There was some age or severity related DIF indicating somewhat unstable across different characteristics of group.IRB No.: DMR94-IRB-179.

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Section: Introductionmentioning

confidence: 99%

A psychometric assessment of the St. George’s respiratory questionnaire in patients with COPD using rasch model analysis

Liang

Hang

et al. 2015

Health Qual Life Outcomes

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“…To a lesser extent, studies applied IRT to PRO measures of specific functioning [27,29-37], pain [35,38-43], psychological constructs [44-46], and work disability [47-51]. Studies also applied IRT to CMs such as measures of disease activity [52-54] and disease damage or radiographic severity [55-57].…”

Section: Resultsmentioning

confidence: 99%

Modern psychometrics applied in rheumatology–A systematic review

Siemons

Klooster

Taal

et al. 2012

BMC Musculoskelet Disord

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BackgroundAlthough item response theory (IRT) appears to be increasingly used within health care research in general, a comprehensive overview of the frequency and characteristics of IRT analyses within the rheumatic field is lacking. An overview of the use and application of IRT in rheumatology to date may give insight into future research directions and highlight new possibilities for the improvement of outcome assessment in rheumatic conditions. Therefore, this study systematically reviewed the application of IRT to patient-reported and clinical outcome measures in rheumatology.MethodsLiterature searches in PubMed, Scopus and Web of Science resulted in 99 original English-language articles which used some form of IRT-based analysis of patient-reported or clinical outcome data in patients with a rheumatic condition. Both general study information and IRT-specific information were assessed.ResultsMost studies used Rasch modeling for developing or evaluating new or existing patient-reported outcomes in rheumatoid arthritis or osteoarthritis patients. Outcomes of principle interest were physical functioning and quality of life. Since the last decade, IRT has also been applied to clinical measures more frequently. IRT was mostly used for evaluating model fit, unidimensionality and differential item functioning, the distribution of items and persons along the underlying scale, and reliability. Less frequently used IRT applications were the evaluation of local independence, the threshold ordering of items, and the measurement precision along the scale.ConclusionIRT applications have markedly increased within rheumatology over the past decades. To date, IRT has primarily been applied to patient-reported outcomes, however, applications to clinical measures are gaining interest. Useful IRT applications not yet widely used within rheumatology include the cross-calibration of instrument scores and the development of computerized adaptive tests which may reduce the measurement burden for both the patient and the clinician. Also, the measurement precision of outcome measures along the scale was only evaluated occasionally. Performed IRT analyses should be adequately explained, justified, and reported. A global consensus about uniform guidelines should be reached concerning the minimum number of assumptions which should be met and best ways of testing these assumptions, in order to stimulate the quality appraisal of performed IRT analyses.

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“…The HAQ-DI has been shown to fulfill the OMERACT requirements of truth, discrimination, and feasibility inpatients with gout. 17 A version has been developed for ankylosing spondylitis. 15 Each scale is scored 0 to 100, with 100 indicating perfect health.…”

Section: Patientsmentioning

confidence: 99%

The Work Instability Scale Predicts Absenteeism in People With Gout and Suggests a Higher Risk for Those in Manual Occupations

Taylor¹,

House²,

Horne³

et al. 2012

Journal of Clinical Rheumatology

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Disease‐related differential item functioning in the work instability scale for rheumatoid arthritis: Converging results from three methods

Cited by 12 publications

References 33 publications

A psychometric assessment of the St. George’s respiratory questionnaire in patients with COPD using rasch model analysis

A psychometric assessment of the St. George’s respiratory questionnaire in patients with COPD using rasch model analysis

Modern psychometrics applied in rheumatology–A systematic review

The Work Instability Scale Predicts Absenteeism in People With Gout and Suggests a Higher Risk for Those in Manual Occupations

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