Children's Somatization Inventory: Psychometric Properties of the Revised Form (CSI-24)

• Published in: Journal of pediatric psychology Vol. 34; no. 4; pp. 430 - 440
• Main Authors: Walker, Lynn S., Beck, Joy E., Garber, Judy, Lambert, Warren
• Format: Journal Article
• Language: English
• Published: Atlanta, GA Oxford University Press 01.05.2009
• Subjects: Abdominal Pain - etiology; Abdominal Pain - psychology; Adolescent; Adult and adolescent clinical studies; Biological and medical sciences; Child; Child clinical studies; Children's Somatization Inventory; chronic abdominal pain; Chronic Disease; factor analysis; Female; functional disorders; Humans; item response theory; Male; Medical sciences; medically unexplained symptoms; Personality Inventory - standards; Personality Inventory - statistics & numerical data; Psychology. Psychoanalysis. Psychiatry; Psychometrics - methods; Psychopathology. Psychiatry; Reproducibility of Results; Series on Single Subject Studies; Severity of Illness Index; somatic symptoms; Somatoform Disorders - diagnosis; Somatoform Disorders - psychology; Somatoform disorders. Psychosomatics; Surveys and Questionnaires; factor analysis; medically unexplained symptoms; functional disorders; somatic symptoms; Children's Somatization Inventory; chronic abdominal pain; item response theory; Human; Factor analysis; Questionnaire; Item response theory; Somatization; Psychometrics; Test validation; Symptomatology; Chronic; Pain; Dysfunction; Somatoform disorder; Child
• ISSN: 0146-8693; 1465-735X; 1465-735X
• DOI: 10.1093/jpepsy/jsn093

Objective To conduct a multimethod psychometric evaluation to refine the Children's Somatization Inventory (CSI) and to investigate its dimensionality. Method The CSI was administered to 876 pediatric patients with chronic abdominal pain at their initial visit to a pediatric gastroenterology clinic. Tools from three psychometric models identified items that most effectively measured the construct of somatization and examined its dimensionality. Results Eleven statistically weak items were identified and removed, creating a 24-item CSI (CSI-24). The CSI-24 showed good psychometrics according to the three measurement models and correlated.99 with the original CSI. The CSI-24 has one dominant general factor but is not strictly unidimensional. Conclusions The CSI-24 is a reliable and psychometrically sound refinement of the original CSI. Findings are consistent with the view that somatization has a strong general factor that represents a continuum of symptom reporting, as well as minor components that represent specific symptom clusters in youth with chronic abdominal pain.