ArticleQuality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation2009
Differential item functioning was negligible in an adaptive test of functional status for patients with knee impairments who spoke English or Hebrew.
Article in Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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Who cites it
12 citing papers in PubMed.
- Psychometric evaluation of separate anxiety and depression item banks - potential supplements to the EORTC CAT Core.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2026Article
- Development and psychometric evaluation of item banks for memory and attention - supplements to the EORTC CAT Core instrument.Health and quality of life outcomes · 2023Article
- Psychometric evaluation of an item bank for computerized adaptive testing of the EORTC QLQ-C30 cognitive functioning dimension in cancer patients.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2017Article
- Development of an item bank for the EORTC Role Functioning Computer Adaptive Test (EORTC RF-CAT).Health and quality of life outcomes · 2016Article
- A proposed set of metrics for standardized outcome reporting in the management of low back pain.Acta orthopaedica · 2016Article
- Development of an item bank for computerized adaptive test (CAT) measurement of pain.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2016Article
- Statistical considerations in the psychometric validation of outcome measures.Clinical orthopaedics and related research · 2013Article
- Psychometric evaluation of the EORTC computerized adaptive test (CAT) fatigue item pool.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2013Article
- Single-item screens identified patients with elevated levels of depressive and somatization symptoms in outpatient physical therapy.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2012Article
- Examining multiple sources of differential item functioning on the Clinician & Group CAHPS® survey.Health services research · 2011Article
- Development of computerized adaptive testing (CAT) for the EORTC QLQ-C30 physical functioning dimension.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2011Article
- Differential item functioning (DIF) analyses of health-related quality of life instruments using logistic regression.Health and quality of life outcomes · 2010Article
Corrections and comments
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveWe examined the presence and impact of differential item functioning (DIF) in a set of knee-specific functional status (FS) items administered using computerized adaptive testing (CAT) among English (United States) and Hebrew (Israel) speaking patients receiving therapy for knee impairments. DIF occurs in an item if probabilities of endorsing responses differ across groups after controlling for the FS measured.
methodsWe analyzed data from 28,320 patients (14,160 U.S., 14,160 Israel) who completed the knee-specific CAT. Items were assessed for DIF by gender, age, symptom acuity, surgical history, exercise history, and language spoken using a hybrid technique that combines multiple ordinal logistic regression and item response theory FS estimates.
resultsSeveral items had non-uniform DIF for covariates including language, but unadjusted and DIF-adjusted functional status estimates were in strong concordance [ICC(2,1) values >/=0.97], and differences between unadjusted and adjusted FS scores represented <0.4% of the unadjusted FS standard deviation.
conclusionsStatistically significant DIF was identified in some items but represented negligible clinical impact. Results suggested no need to adjust items for DIF when assessing FS outcomes across groups of patients with knee impairments who answer the knee CAT items in English in the United States or Hebrew in Israel. These findings suggest negligible differences in cultural perceptions between English and Hebrew wording of these knee-specific CAT FS items.
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