Calibration of an item bank in 474 orthopedic patients using Rasch analysis for computer-adaptive assessment of anxiety

ORCID
0000-0002-2209-0516
Affiliation
Department of Clinical Psychology and Psychotherapy, Institute of Psychology and Education, University of Ulm, Ulm, Germany
Kallinger, Selina;
Affiliation
Department of Clinical Psychology and Psychotherapy, Institute of Psychology and Education, University of Ulm, Ulm, Germany
Scharm, Henry;
GND
137926561
Affiliation
Institute of Medical Psychology and Medical Sociology, University Hospital of RWTH Aachen, Aachen, Germany
Böcker, Maren;
GND
137232632
LSF
59807
Affiliation
Department of Clinical Psychology, University of Duisburg-Essen, Essen, Germany
Forkmann, Thomas;
GND
17373104X
Affiliation
Department of Clinical Psychology and Psychotherapy, Institute of Psychology and Education, University of Ulm, Ulm, Germany
Baumeister, Harald

Objective: To calibrate an item bank of anxiety-related questions for use in orthopedic patients within a computer-adaptive test.

Design: This is a psychometric study. Setting: The sample of orthopedic patients was recruited in two orthopedic rehabilitation clinics in Germany.

Subjects: A total of 474 orthopedic rehabilitation patients were recruited for this study.

Interventions: Not applicable.

Main measures: The main measure is an adapted version of an existing anxiety item pool for cardiovascular rehabilitation patients.

Results: The results of the confirmatory factor analysis and Mokken analysis confirmed a one-factor structure and double monotonicity. An anxiety item bank (48 items) could be developed and calibrated using Rasch analysis. It fitted to the Rasch model with a non-significant item–trait interaction ( χ 2 (203) = 172.59; P  = .94) and was free of differential item functioning. Unidimensionality could be verified and the person separation reliability was .96. The category threshold parameters varied between 4.72 and 3.16 (7.88 logits).

Conclusion: The unidimensional anxiety item bank provides the basis for a computer-adaptive test to assess a wide range of anxiety in rehabilitation patients with orthopedic diseases with very good psychometric characteristics.

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