Title

Item Response Theory and Computerized Adaptive Testing: Implications for Outcomes Measurement in Rehabilitation

UMMS Affiliation

Department of Quantitative Health Sciences

Publication Date

2-2005

Document Type

Article

Subjects

Outcome Assessment (Health Care); Rehabilitation

Disciplines

Biostatistics | Epidemiology | Health Services Research

Abstract

Objective: To evaluate computerized adaptive testing (CAT) measures of rehabilitation outcomes.

Study Design: Physical functioning questions were calibrated via item response theory (IRT) and administered with CAT software.

Subjects: 485 adults interviewed during postacute care rehabilitation (simulation study) and 26 adults who completed CAT and personal interviews (CAT pilot study).

Main Outcome Measures: Patient acceptance and respondent burden, reliability, and discriminant validity.

Results: In the simulation study, CAT-based estimates correlated highly (r=.93 and r=.98) with criteria, minimized ceiling and floor effects, and reduced respondent burden while achieving high reliability. Pilot study patients preferred self-administered CAT surveys, and CAT scores discriminated well across severity levels.

Conclusions: CAT software has considerable potential to improve physical functioning measurement in rehabilitation settings.

Rights and Permissions

Citation: Ware JE, Gandek B, Sinclair SJ, Bjorner JB. Item Response Theory and Computerized Adaptive Testing: Implications for Outcomes Assesment in Rehabilitation. Rehabilitation Psychology. 2005;50(1):71-78.

Journal/Book/Conference Title

Rehabilitation Psychology