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 ((203) = 172.59; = .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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