@article{214114748fba4119b65041cc92367297,
title = "Item response theory analysis of Centers for Disease Control and Prevention Health-Related Quality of Life (CDC HRQOL) items in adults with arthritis",
abstract = "Background: Examine 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. Methods: 2182 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. Results: The IRT parameter estimates for the five-item CDC-PH all appeared reasonable. The three-item CDC-MH did not have reasonable parameter estimates. Conclusions: The 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.",
author = "Mielenz, {Thelma J.} and Callahan, {Leigh F.} and Edwards, {Michael C.}",
note = "Funding Information: This research was supported by a 2005 North Carolina Chapter{\textquoteright}s Arthritis Foundation New Investigator Award. A 2001 Arthritis Foundation New Investigator Award supported the original data collection. This research was supported in part by Grant 1 R49 CE002096‐01 from the National Center for Injury Prevention and Control, Centers for Disease Control and Prevention to the Center for Injury Epidemiology and Prevention at Columbia University. This research was also supported in part by the Malka Fund. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the National Institutes of Health and Centers for Disease Control and Prevention. This research was supported in part by Contract Number 1IP2PI000797-01 from the Patient-Centered Outcomes Research Institute. The North Carolina Family Medicine Research Network (NC-FM-RN) is an organization dedicated to fostering practice-based research. The North Carolina Health Project (NCHP) is a practice-based cohort of adult patients who were enrolled by the NC-FM-RN from a sample of Family Practices in North Carolina. Projects are jointly sponsored by the Department of Family Medicine, the Thurston Arthritis Research Center, and the Cecil G. Sheps Center for Health Services Research at the University of North Carolina at Chapel Hill, in collaboration with the North Carolina Academy of Family Physicians. The project co-directors are Leigh Callahan, PhD, and Philip Sloane, MD, MPH. Participating Family Practices have included: Biddle Point Health Center, Charlotte; Bladen Medical Associates, Elizabethtown; Blair Family Medicine, Wallace; Chatham Primary Care, Siler City; Community Family Practice, Asheville; Dayspring Family Medicine, Eden; Goldsboro Family Physicians, Goldsboro; Henderson Family Health Center, Hendersonville; North Park Medical Center, Charlotte; Orange Family Medical Center, Hillsborough (pilot site); Person Family Medical Center, Roxboro; Robbins Family Practice, Robbins; South Cabarrus Family Physicians, Harrisburg, Concord, Mt. Pleasant & Kannapolis; and Summerfield Family Practice, Summerfield. We would also like to thank the following physicians for encouraging their patients to participate in our database and outcomes studies: H. Vann Austin, Franc Barada, Robert Berger, Mary Anne Dooley, William Gruhn, Robert Harrell, Tatiana Huguenin, Beth Jonas, Joanne Jordan, Fathima Kabir, Elliott Kopp, Andrew Laster, Kara Martin, Gwenesta Melton, Nicholas Patrone, Kate Queen, Westley Reeves, Hanno Richards, Alfredo Rivadeneira, William Rowe, Gordon Senter, Paul Sutej, Claudia Svara, Anne Toohey, William Truslow, John Winfield, and William Yount. Special thanks go to Robert DeVellis, PhD, Shannon Currey, PhD, Jennifer Milan Polinski, MPH, Britta Schoster, MPH, Katherine Buysse, BA, Matthew Morrison, BA. Publisher Copyright: {\textcopyright} 2016 Mielenz et al.",
year = "2016",
month = mar,
day = "12",
doi = "10.1186/s12955-016-0444-4",
language = "English (US)",
volume = "14",
journal = "Health and Quality of Life Outcomes",
issn = "1477-7525",
publisher = "BioMed Central",
number = "1",
}