ArticleQuality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation2015
Testing item response theory invariance of the standardized Quality-of-life Disease Impact Scale (QDIS(®)) in acute coronary syndrome patients: differential functioning of items and test.
Article in Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed, 9 citations in OpenAlex.
- The QDIS-7: using one scale to measure the disease-specific quality-of-life impact of different medical conditions.Scientific reports · 2025Article
- Improving multimorbidity measurement using individualized disease-specific quality of life impact assessments: predictive validity of a new comorbidity index.Health and quality of life outcomes · 2022Article
- Impact of comorbid conditions on disease-specific quality of life in older men and women with atrial fibrillation.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2020Article
- Language-related differential item functioning between English and German PROMIS Depression items is negligible.International journal of methods in psychiatric research · 2017Article
- Standardizing disease-specific quality of life measures across multiple chronic conditions: development and initial evaluation of the QOL Disease Impact Scale (QDIS®).Health and quality of life outcomes · 2016Article
- Evaluation of smoking-specific and generic quality of life measures in current and former smokers in Germany and the United States.Health and quality of life outcomes · 2015Article
- The Validity of Disease-specific Quality of Life Attributions Among Adults with Multiple Chronic Conditions.International journal of statistics in medical researchArticle
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Authors and funding
5 authors at 1 institution in 1 country.
Funding
Abstract
purposeThe Quality-of-life (QOL) Disease Impact Scale (QDIS(®)) standardizes the content and scoring of QOL impact attributed to different diseases using item response theory (IRT). This study examined the IRT invariance of the QDIS-standardized IRT parameters in an independent sample.
methodThe differential functioning of items and test (DFIT) of a static short-form (QDIS-7) was examined across two independent sources: patients hospitalized for acute coronary syndrome (ACS) in the TRACE-CORE study (N = 1,544) and chronically ill US adults in the QDIS standardization sample. "ACS-specific" IRT item parameters were calibrated and linearly transformed to compare to "standardized" IRT item parameters. Differences in IRT model-expected item, scale and theta scores were examined. The DFIT results were also compared in a standard logistic regression differential item functioning analysis.
resultsItem parameters estimated in the ACS sample showed lower discrimination parameters than the standardized discrimination parameters, but only small differences were found for thresholds parameters. In DFIT, results on the non-compensatory differential item functioning index (range 0.005-0.074) were all below the threshold of 0.096. Item differences were further canceled out at the scale level. IRT-based theta scores for ACS patients using standardized and ACS-specific item parameters were highly correlated (r = 0.995, root-mean-square difference = 0.09). Using standardized item parameters, ACS patients scored one-half standard deviation higher (indicating greater QOL impact) compared to chronically ill adults in the standardization sample.
conclusionThe study showed sufficient IRT invariance to warrant the use of standardized IRT scoring of QDIS-7 for studies comparing the QOL impact attributed to acute coronary disease and other chronic conditions.
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