Item response theory analysis of Centers for Disease Control and Prevention Health-Related Quality of Life (CDC HRQOL) items in adults with arthritis

Health and Quality of Life Outcomes

Research

Thelma J. Mielenz¹  Michael C. Edwards²  Leigh F. Callahan³ 

[1] Department of Epidemiology, Mailman School of Public Health, Columbia University, 722 West 168th St. Rm 512, 10032, New York, NY, USA;Department of Psychology, The Ohio State University, Columbus, OH, USA;Thurston Arthritis Research Center, School of Medicine, University of North Carolina, Chapel Hill, USA;Departments of Medicine and Social Medicine, School of Medicine, University of North Carolina, Chapel Hill, USA;

关键词: Differential Item Functioning;    Item Response Theory;    Behavioral Risk Factor Surveillance System;    Item Parameter;    Grade Response Model;   

DOI  :  10.1186/s12955-016-0444-4

 received in 2015-07-16, accepted in 2016-03-07,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundExamine the feasibility of performing an item response theory (IRT) analysis on two of the Centers for Disease Control and Prevention health-related quality of life (CDC HRQOL) modules – the 4-item Healthy Days Core Module (HDCM) and the 5-item Healthy days Symptoms Module (HDSM). Previous principal components analyses confirm that the two scales both assess a mix of mental (CDC-MH) and physical health (CDC-PH). The purpose is to conduct item response theory (IRT) analysis on the CDC-MH and CDC-PH scales separately.Methods2182 patients with self-reported or physician-diagnosed arthritis completed a cross-sectional survey including HDCM and HDSM items. Besides global health, the other 8 items ask the number of days that some statement was true; we chose to recode the data into 8 categories based on observed clustering. The IRT assumptions were assessed using confirmatory factor analysis and the data could be modeled using an unidimensional IRT model. The graded response model was used for IRT analyses and CDC-MH and CDC-PH scales were analyzed separately in flexMIRT.ResultsThe IRT parameter estimates for the five-item CDC-PH all appeared reasonable. The three-item CDC-MH did not have reasonable parameter estimates.ConclusionsThe CDC-PH scale is amenable to IRT analysis but the existing The CDC-MH scale is not. We suggest either using the 4-item Healthy Days Core Module (HDCM) and the 5-item Healthy days Symptoms Module (HDSM) as they currently stand or the CDC-PH scale alone if the primary goal is to measure physical health related HRQOL.

【 授权许可】

CC BY   
© Mielenz et al. 2016