Children’s Somatization Inventory (SCI)

Abstract

The Children’s Somatization Inventory (SCI) is a widely utilized self-report instrument designed to measure the frequency and severity of physical symptoms indicative of somatization in pediatric populations. Developed by Walker, Garber, and Greene in 1991, the original scale comprised 37 items covering various bodily systems. The SCI aims to quantify somatic distress, often in the absence of adequate medical explanation, making it a critical screening tool in pediatric psychology and clinical health settings.

A notable revision, the 24-item version (CSI-24), was later introduced to enhance the scale’s psychometric properties, focusing on core symptoms that best distinguish children with somatization-related disorders. The SCI is frequently employed in research concerning chronic pain conditions, such as recurrent abdominal pain and headache, to assess the psychosocial correlates of these physical complaints.

Keywords

Children’s Somatization Inventory, SCI, CSI-24, Somatization, Somatic Symptoms, Pediatric Psychology, Medically Unexplained Symptoms, Functional Pain, Self-report measure, Psychometrics

Authors

Walker, L. S., Garber, J., and Greene, W.

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Purpose

The primary purpose of the SCI is to serve as a fast and effective screening tool for identifying children and adolescents who report a high frequency and intensity of somatic symptoms. It provides a standardized method for quantifying the extent of physical distress that may be linked to psychological factors rather than underlying organic pathology.

In clinical practice, the scale helps differentiate between children with functional somatic syndromes (e.g., functional abdominal pain) and those with clear organic diagnoses. In research, it is crucial for studying the relationship between stress, psychological distress, and physical symptom reporting in youth, contributing significantly to the understanding of pediatric chronic pain.

Construct

The SCI measures the psychological construct of somatization, which is defined as the tendency to experience and communicate psychological distress through physical symptoms, often leading to seeking medical attention for these physical complaints. The inventory captures symptoms across various domains, including pain (headache, abdominal pain), gastrointestinal issues, pseudoneurological symptoms, and cardiopulmonary complaints, reflecting the broad diagnostic criteria historically associated with somatoform disorders.

Validity

The validity of the SCI, particularly the CSI-24, has been strongly established across multiple studies. Criterion validity is supported by the scale’s ability to successfully discriminate between clinical groups, such as children with functional abdominal pain versus those with organic gastrointestinal disease. Furthermore, the total score correlates positively with measures of functional disability and healthcare utilization.

Convergent validity is demonstrated through significant positive correlations with other indicators of psychological distress, including self-report measures of anxiety, depression, and parental reports of child somatization. These findings confirm that the SCI is accurately measuring the intended construct of symptom reporting associated with psychological distress.

Reliability

The SCI demonstrates high levels of internal consistency across diverse samples of children and adolescents. The internal reliability (measured by Cronbach’s alpha) typically ranges from 0.85 to 0.90, indicating excellent homogeneity among the symptom items. This robust internal consistency confirms that the items reliably measure a common underlying construct.

Test-retest reliability has also been shown to be acceptable over short intervals, supporting the temporal stability of the scores when symptoms are expected to remain consistent. This stability is crucial for using the SCI in longitudinal research and clinical monitoring of symptom severity over time.

Factor Analysis

Early factor analysis of the original 37-item SCI often suggested a complex structure. However, the development of the revised 24-item version (CSI-24) was specifically guided by factor analytic methods to achieve a more parsimonious and clinically useful structure. Confirmatory factor analysis of the CSI-24 strongly supports a robust, unidimensional factor model.

This strong single-factor structure indicates that the 24 retained items primarily reflect one underlying dimension—the general propensity for somatization. This finding justifies the clinical use of the CSI-24 total score as a comprehensive measure of somatic symptom reporting severity in youth.

Instrument

Test Type: Self-report Questionnaire (Screening and Severity Assessment)

Format: Paper-and-pencil or Digital Administration; 5-point Likert scale.

Language Available: English (Original); translations may exist based on research needs.

Population Group: Children and Adolescents

Age Group: Typically 8 to 18 years old.

Population Details: Used across community samples, pediatric primary care patients, and specialized clinical samples (e.g., chronic abdominal pain clinics).

Test Methodology: Respondents rate how much they have been bothered by each symptom over a specified period (usually the last two weeks or month) using the following scale: 0 = Not at all, 1 = A little, 2 = Some, 3 = A lot, 4 = A whole lot. Total scores are calculated by summing item responses.

Keywords

Children’s Somatization Inventory, SCI, CSI-24, Somatic Symptom Disorder, Pediatric Pain, Likert Scale, Psychological Assessment, Recurrent Abdominal Pain, Psychometric Properties, Functional Symptoms

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Authors

Author ORCID Identifier: N/A (Information not provided in source.)

Affiliation Email addresses: N/A (Information not provided in source.)

Correspondence Address: N/A (Information not provided in source. Primary authors were affiliated with Vanderbilt University or related institutions during initial publication.)

Permissions & Fee and Test Year

The Children’s Somatization Inventory (SCI) was initially published in 1991. The revised 24-item form (CSI-24) was formally detailed in 2009. The scale is often utilized in academic research without explicit fees, though formal permission should be sought from the primary authors (L. S. Walker) or the publishing journal/sourcebook provider for large-scale commercial use.

The instrument details and scoring information were compiled in: Fischer, Joel, and Corcoran, Kevin J. (2007). Measures for Clinical Practice and research: A sourcebook. (4th ed.). NY. Oxford University Pr. Vol. 1, Page(s): 481-483.

Reference’s

• Walker, L. S., Garber, J., and Greene, W. (1991). Somatization symptoms in pediatric abdominal pain patients: Relation to chronicity of abdominal pain and parent somatization. Journal of Abnormal Child Psychology, 19, 379–394.
• Garber, J., Walker, L.S., & Zeman, J. (1991). Somatization symptoms in a community sample of children and adolescents: Further validation of the Children’s Somatization Inventory. Psychological Assessment, 4, 588-595.
• Walker, L. S., Garber, J., & Greene, J. W. (1993). Psychosocial correlates of recurrent childhood pain: A comparison of pediatric patients with recurrent abdominal pain, organic illness, and psychiatric disorders. Journal of Abnormal Psychology, 102, 248–258.
• Walker, Garber and Greene. (1991). Children’s Somatization Inventory (SCI). In Fischer, Joel., Corcoran, Kevin J. (2007). Measures for Clinical Practice and research: A sourcebook. (4th ed.). NY. Oxford University Pr. Vol. 1, Page(s): 481-483.
• Walker, L. S., Garber, J., Smith, C. A., Claar, R. L. (2005). Testing a Model of Pain Appraisal and Coping in Children With Chronic Abdominal Pain. Health Psychology, 24(4), 364–374.
• Walker, L. S., Beck, J. E., Garber, J., et al. (2009). Children’s Somatization Inventory: Psychometric Properties of the Revised Form (CSI-24). Journal of Pediatric Psychology, 34(4), 430-440. The full instrument details and psychometric analysis can also be found at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2722132/

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Items of the Children’s Somatization Inventory (SCI)

The following items constitute the Children’s Somatization Inventory (SCI). Items marked with an asterisk (*) are included in the revised 24-item version (CSI-24).

Scoring: 0= Not at all, 1 = A little, 2= Some, 3= A lot, 4= A whole lot

1. Headache*
2. Faintness or dizziness *
3. Pain – heart or chest *
4. Feeling in Low energy or slowed down*
5. Pain in lower back *
6. Sore muscles *
7. Trouble getting your breath (when you’re not exercising)*
8. Hot or cold spells (suddenly feeling hot or cold for no reasons)*
9. Numbness or tingling in part of your body*
10. Lump in your throat
11. Weakness (feeling weak) in parts of your body*
12. Heavy feelings in your arms, legs (when they feel too heavy to more)*
13. Nausea or upset stomach (feeling like you might throw up, or having an upset stomach)*
14. Constipation (when it’s hard to have a B.M. or go poop)*
15. Loose (runny) BM’s or diarrhea*
16. Pain in your stomach or abdomen (stomach aches)*
17. Heart beating too fast (even when you’re not exercising)*
18. Difficulty swallowing*
19. Losing your voice*
20. Deafness (when you cannot hear)
21. Double vision (when you see two of everything, even with glasses on)
22. Blurred vision (when things look blurry, even with glasses on)*
23. Blindness (when you can’t see at all)
24. Fainting or passing out
25. Memory loss or amnesia (losing tour memory, not being able to remember anything)
26. Seizures or convulsions (your body moving or shaking and you can’t control it)
27. Trouble walking
28. Paralysis or muscle weakness (your muscles are too weak to move, like you can’t move your arms or legs at all)
29. Difficulty urinating (peeing)
30. Vomiting (or throwing up)*
31. Feeling bloated or gassy*
32. Food makes you sick*
33. Pain in your knees, elbows or other joints*
34. Pain in your arms or legs*
35. Pain when you urination or pee
36. Girl only: in the last two weeks, have you had your period? Yes, No
37. Girl only: if yes, were the symptoms you reported above related to your period?