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Item response theory assumptions were adequately met by the Oxford hip and knee scores by Conrad J. Harrison; Constantin Yves Plessen; Gregor Liegl; Jeremy N. Rodrigues; Shiraz A. Sabah; David J. Beard; Felix Fischer is a Decision Sciences article available to read on EtoBox.

What is Item response theory assumptions were adequately met by the Oxford hip and knee scores about?

Objectives To develop item response theory (IRT) models for the Oxford Hip and Knee Scores (OHS/OKS) which convert patient responses into continuous scores with quantifiable precision, and provide these as web applications for efficient score conversion. Study design and setting Data from the NHS PROMs programme were used to test the assumptions of IRT (unidimensionality, monotonicity, local independence, and measurement invariance) before fitting models to preoperative response patterns obtained from patients undergoing primary elective hip or knee arthroplasty. The hip and knee datasets contained 321,147 and 355,249 patients, respectively. Results Scree plots, Kaiser criterion analyses, and confirmatory factor analyses confirmed unidimensionality and Mokken analysis confirmed monotonicity of both scales. In each scale, all item pairs shared a residual correlation of ≤ 0.20. At the test-level, both scales showed measurement invariance by age and gender. Both scales provide precise measurement in preoperative settings, but demonstrate poorer precision and ceiling effects in postoperative settings. Conclusions We provide IRT parameters and web applications that can convert OHS or OK

Who reads Item response theory assumptions were adequately met by the Oxford hip and knee scores?

Author

Conrad J. Harrison; Constantin Yves Plessen; Gregor Liegl; Jeremy N. Rodrigues; Shiraz A. Sabah; David J. Beard; Felix Fischer

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Decision Sciences (Social Sciences)