The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Using item response theory improved responsiveness of patient-reported outcomes measures in carpal tunnel syndrome

På svenska

Author

Summary, in English

Objective: To compare responsiveness based on item response theory (IRT) with that based on conventional scoring for two patient-reported outcomes measures in carpal tunnel syndrome (CTS); the short disabilities of the arm, shoulder, and hand (QuickDASH) measure, and the 6-item CTS symptoms scale (CTS-6). Study Design and Setting: Prospective cohort study of patients with CTS undergoing carpal tunnel release at one orthopedic department. Of 455 consecutive patients, 343 completed the QuickDASH and the CTS-6 before and within 1 year after surgery. IRT-based and conventional scores were compared in subgroups according to global rating of change in hand status and treatment satisfaction. The effect size (ES) and the area under the receiver operating characteristic (ROC) curve were used as measures of responsiveness. Results: The mean value for the IRT-based QuickDASH estimate was -0.09 (standard deviation [SD] = 1.13) preoperatively and -2.14 (SD = 1.79) postoperatively (ES = -1.8) and for the CTS-6 estimate was 0.29 (SD = 1.36) preoperatively and -3.87 (SD = 2.3) postoperatively (ES = -3.1), indicating very large improvement. The ES for the QuickDASH and CTS-6 were very large (-2.4 and -3.8), respectively, in the group with the largest perceived improvement and decreased with lower perceived improvement. The ES was consistently larger with IRT-based scoring than conventional scoring. The AUC for the QuickDASH and CTS-6 exceeded 0.85. Conclusion: IRT-based scoring showed high responsiveness for the QuickDASH and CTS-6, and the ES were larger than those estimated using conventional scoring. (C) 2012 Elsevier Inc. All rights reserved.

Publishing year

2012

Language

English

Pages

325-334

Publication/Series

Journal of Clinical Epidemiology

Volume

65

Issue

3

Document type

Journal article

Publisher

Elsevier

Topic

  • Public Health, Global Health, Social Medicine and Epidemiology

Keywords

  • Carpal tunnel syndrome
  • QuickDASH
  • CTS symptoms scale
  • Item response
  • theory
  • Patient-reported outcomes
  • Effect size
  • AUC

Status

Published

ISBN/ISSN/Other

  • ISSN: 1878-5921