Children's Somatization Inventory: psychometric properties of the revised form (CSI-24).
OBJECTIVE
To conduct a multimethod psychometric evaluation to refine the Children's Somatization Inventory (CSI) and to investigate its dimensionality.


METHODS
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.
Walker
Lynn S
LS
Division of Adolescent Medicine and Behavioral Science, Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN 37232-3571, USA. lynn.walker@vanderbilt.edu
Beck
Joy E
JE
Garber
Judy
J
Lambert
Warren
W
D015746:Abdominal Pain / Q000209:etiology* / Q000523:psychology*; D000293:Adolescent; D002648:Child; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008297:Male; D010555:Personality Inventory / Q000592:standards* / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000379:methods*; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D013001:Somatoform Disorders / Q000175:diagnosis* / Q000523:psychology; D011795:Surveys and Questionnaires
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