Item response theory analysis of the patient satisfaction with cancer-related care measure: A psychometric investigation in a multicultural sample of 1,296 participants

Pascal Jean-Pierre, Ying Cheng, Electra Paskett, Can Shao, Kevin Fiscella, Paul Winters, Peter C. Raich, Richard Roetzheim, Steve T. Rosen, Donald J. Dudley, Karen M. Freund, Victoria Warren-Mears, Steven R. Patierno

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Background: We developed and validated a Patient Satisfaction with Cancer-Related Care (PSCC) measure using classical test theory methods. The present study applied item response theory (IRT) analysis to determine item-level psychometric properties, facilitate development of short forms, and inform future applications for the PSCC. Methods: We applied unidimensional IRT models to PSCC data from 1,296 participants (73 % female; 18 to 86 years). An unconstrained graded response model (GRM) and a Rasch Model were fitted to estimate indices for model comparison using likelihood ratio (LR) test and information criteria. We computed item and latent trait parameter estimates, category and operating characteristic curves, and tested information curves for the better fitting model. Results: The GRM fitted the data better than the Rasch Model (LR=828, df=17, p<0.001). The log-likelihood (-17,390.38 vs. -17,804.26) was larger, and the AIC and BIC were smaller for the GRM compared to the Rash Model (AIC=34,960.77 vs. 35,754.73; BIC=35,425.80 vs. 36,131.92). Item parameter estimates (IPEs) showed substantial variation in items' discriminating power (0.94 to 2.18). Standard errors of the IPEs were small (threshold parameters mostly around 0.1; discrimination parameters 0.1 to 0.2), confirming the precision of the IPEs. Conclusion: The GRM provides precise IPEs that will enable comparable scores from different subsets of items, and facilitate optimal selections of items to estimate patients' latent satisfaction level. Given the large calibration sample, the IPEs can be used in settings with limited resources (e.g., smaller samples) to estimate patients' satisfaction.

Original languageEnglish (US)
Pages (from-to)2229-2240
Number of pages12
JournalSupportive Care in Cancer
Volume22
Issue number8
DOIs
StatePublished - Aug 2014

Keywords

  • Cancer Disparities
  • Item Response Theory
  • Measure development
  • Psychometric validation
  • Psychometrics
  • Race-ethnicity

ASJC Scopus subject areas

  • Oncology

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