Psychometric Evaluation and Calibration of Health-Related Quality of Life Item Banks

Plans for the Patient-Reported Outcomes Measurement Information System (PROMIS)

Published in: Medical Care, v. 45, no. 5, Suppl. 1, May 2007, p. S22-S31

Posted on RAND.org on January 01, 2007

by Bryce B. Reeve, Ron D. Hays, Jakob B. Bjorner, Karon F. Cook, Paul K. Crane, Jeanne A. Teresi, David Thissen, Dennis A. Revicki, David J. Weiss, Ronald K. Hambleton, et al.

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BACKGROUND: The construction and evaluation of item banks to measure unidimensional constructs of health-related quality of life (HRQOL) is a fundamental objective of the Patient-Reported Outcomes Measurement Information System (PROMIS) project. OBJECTIVES: Item banks will be used as the foundation for developing short-form instruments and enabling computerized adaptive testing. The PROMIS Steering Committee selected 5 HRQOL domains for initial focus: physical functioning, fatigue, pain, emotional distress, and social role participation. This report provides an overview of the methods used in the PROMIS item analyses and proposed calibration of item banks. ANALYSES: Analyses include evaluation of data quality (eg, logic and range checking, spread of response distribution within an item), descriptive statistics (eg, frequencies, means), item response theory model assumptions (unidimensionality, local independence, monotonicity), model fit, differential item functioning, and item calibration for banking. RECOMMENDATIONS: Summarized are key analytic issues; recommendations are provided for future evaluations of item banks in HRQOL assessment.

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