PSYCHOMETRIC ANALYSIS AND MODIFICATION OF THE GIESSEN SOMATIC COMPLAINTS INVENTORYJournal: Journal of the Grodno State Medical University (Vol.20, No. 2)
Publication Date: 2022-05-25
Authors : T. E. Tomaschik; M. A. Assanovich;
Page : 204-208
Keywords : diagnostic inventory for somatoform disorders; construct validity; reliability; Rasch model;
The Giessen Somatic Complaints Inventory is one of the most popular somatoform disorder diagnostic questionnaires. The Belarusian version of the Giessen Somatic Complaints Inventory has not been developed. Purpose. Psychometric analysis and modification of the Giessen Somatic Complaints Inventory. Material and methods. 227 patients with depressive, neurotic, stress-related and somatoform disorders were examined using the Giessen Somatic Complaints Inventory. The Rasch metric system was used to assess the psychometric properties of the Giessen Somatic Complaints Inventory and its modification. Results. The modified Giessen Somatic Complaints Inventory is reasonably accurate, with better distributional concordance scores for moderate and severe somatic symptoms. Two diagnostic items of the Giessen Somatic Complaints Inventory with low construct validity were identified. The questionnaire was modified by excluding nonvalid items. A modified version of the Giessen Somatic Complaints Inventory showed high reliability (reliability index = 0.91) and discrimination (the inventory is able to differentiate 14 levels of somatic symptoms). Factor analysis revealed the heterogeneity of the structure of the questionnaire, which reflects the polymorphism of somatoform symptoms. Conclusions. The Belarusian version of the Giessen questionnaire of somatic complaints with acceptable diagnostic properties and psychometric characteristics has been developed.
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