Use of Rasch Analysis in the Evaluation of the Oropharyngeal Mucositis Quality of Life Scale
| Autor: | Raymond Liang, Siu Fai Leung, Jack Lee, Karis Kin Fong Cheng, David R. Thompson, Rebecca M.W. Yeung, Josepha W.M. Tai |
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| Rok vydání: | 2011 |
| Předmět: |
Adult
Male Gerontology medicine.medical_specialty Psychometrics behavioral disciplines and activities Classical test theory Young Adult Quality of life Surveys and Questionnaires Mucositis medicine Humans General Nursing Reliability (statistics) Aged Aged 80 and over Stomatitis Models Statistical Rasch model business.industry Polytomous Rasch model Middle Aged medicine.disease Differential item functioning Chemotherapy Adjuvant Head and Neck Neoplasms Quality of Life Psychometric software Physical therapy Female Radiotherapy Adjuvant business |
| Zdroj: | Nursing Research. 60:256-263 |
| ISSN: | 0029-6562 |
| Popis: | Background: Oropharyngeal mucositis (OM) is a significant clinical problem causing profound impairment of health-related quality of life (HQoL) for patients undergoing cancer therapy. The Oropharyngeal Mucositis-Specific Health-Related Quality of Life Measure (OMQoL) was developed using classical test theory to measure the self-perceived HQoL of patients with mucositis. Objectives: The aim of this study was to analyze the OMQoL according to the Rasch model and, on the basis of results, determine whether improvements could be made. Method: A multicenter approach was used, and 210 patients treated with stomatotoxic chemotherapy (36%), high-dose myeloablative chemotherapy +/- total body irradiation (10%), or head and neck irradiation +/- chemotherapy (54%) completed the OMQoL. The Partial Credit Model of Rasch analysis was applied to evaluate the 31-item OMQoL using WINSTEPS and R software. Unidimensionality (measurement of a single construct), item fit, response category performance, person separation reliability, targeting of item difficulty to person ability, and differential item functioning (DIF) were examined. Results: Of 31 items, 5 were removed due to misfit; the OMQoL was reduced to 26 items with acceptable information weighted fit/outlier-sensitive fit indices (within 0.7-1.3) and eigenvalue units (0.2 with reliability >.8). Nevertheless, some of the items in the OMQoL might not be targeted effectively to patients with low levels of OM. Significant uniform and nonuniform DIFs were not found for gender (uniform DIF, p = .26; nonuniform DIF, p= .24) and age (uniform DIF, p = .95; nonuniform DIF, p = .65). Discussion: Rasch analysis reveals that the reduced 26-item OMQoL is unidimensional and is adequate to measure HQoL for patients with OM regardless of gender and age group. This improved version can provide a common platform for nurses to use in their assessment, caring, and treatment of patients with OM. |
| Databáze: | OpenAIRE |
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