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Forkmann T, Norra C, Wirtz M, Gauggel S, Boecker M. Psychometric evaluation of the Rasch-based depression screening in patients with neurologic disorders.
To provide a first evaluation of the Rasch-Based Depression Screening (DESC) in consecutive patients with neurologic disorders.
Hospital specializing in neurologic disorders.
Eligible patients (N=323; mean age +/- SD, 53.4+/-17.2y; 49.3% women) age 18 years and older.
Not applicable. MAIN OUTCOME
DESC with 2 parallel versions.
Both versions of the DESC showed good item separation (DESC-I=4.96; DESC-II=4.94) and person separation (DESC-I=2.01; DESC-II=2.14) as well as item separation reliability (DESC-I=.96; DESC-II=.96) and person separation reliability (DESC-I=.80; DESC-II=.82). All items fit the Rasch model (infit and outfit mean squares =1.3). There were no signs of violation of unidimensionality. One item of DESC-I showed differential item functioning because of age and 1 item because of sex. Parallel test reliability of the 2 DESC forms was r equal to .92.
The DESC shows good psychometric characteristics that suggest high psychometric quality of the instrument in patients with neurologic disorders. Differential item functioning on single items needs further examination but should not substantially interfere with the valid interpretation of DESC sum scores.
Institute of Medical Psychology and Medical Sociology, University Hospital of Rheinisch-Westfälische Technische Hochschule, Aachen, Germany.
This article was published in the following journal.
Name: Archives of physical medicine and rehabilitation
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