|Title||Development of an item bank for the assessment of depression in persons with mental illnesses and physical diseases using Rasch analysis|
|Publication Type||Journal Article|
|Year of Publication||2009|
|Authors||Forkmann, T, Boecker, M, Norra, C, Eberle, N, Kircher, T, Schauerte, P, Mischke, K, Westhofen, M, Gauggel, S, Wirtz, M|
|ISBN Number||0090-5550 (Print)0090-5550 (Linking)|
|Keywords||Adaptation, Psychological, Adult, Aged, Depressive Disorder/*diagnosis/psychology, Diagnosis, Computer-Assisted, Female, Heart Diseases/*psychology, Humans, Male, Mental Disorders/*psychology, Middle Aged, Models, Statistical, Otorhinolaryngologic Diseases/*psychology, Personality Assessment/statistics & numerical data, Personality Inventory/*statistics & numerical data, Psychometrics/statistics & numerical data, Questionnaires, Reproducibility of Results, Sick Role|
OBJECTIVE: The calibration of item banks provides the basis for computerized adaptive testing that ensures high diagnostic precision and minimizes participants' test burden. The present study aimed at developing a new item bank that allows for assessing depression in persons with mental and persons with somatic diseases. METHOD: The sample consisted of 161 participants treated for a depressive syndrome, and 206 participants with somatic illnesses (103 cardiologic, 103 otorhinolaryngologic; overall mean age = 44.1 years, SD =14.0; 44.7% women) to allow for validation of the item bank in both groups. Persons answered a pool of 182 depression items on a 5-point Likert scale. RESULTS: Evaluation of Rasch model fit (infit < 1.3), differential item functioning, dimensionality, local independence, item spread, item and person separation (>2.0), and reliability (>.80) resulted in a bank of 79 items with good psychometric properties. CONCLUSIONS: The bank provides items with a wide range of content coverage and may serve as a sound basis for computerized adaptive testing applications. It might also be useful for researchers who wish to develop new fixed-length scales for the assessment of depression in specific rehabilitation settings.