Children’s Somatization Inventory (SCI)

Abstract

The Children’s Somatization Inventory (SCI) is a robust self-report measure developed to assess the frequency and intensity of somatic symptoms in children and adolescents. Initially proposed as a 37-item scale, it was later refined into the 24-item Children’s Somatization Inventory, Revised (CSI-24). This instrument is widely used in clinical and research settings within pediatric psychology to quantify the severity of medically unexplained symptoms associated with functional somatic syndromes, such as chronic pain and somatization disorder features. The SCI provides clinicians and researchers with a reliable measure of somatic symptom burden over the preceding two weeks.

Keywords

Somatization, Children, Adolescents, Somatic Symptoms, Chronic Pain, CSI, CSI-24, Pediatric Psychology, Self-Report Inventory, Functional Somatic Syndrome

Authors

Laura S. Walker, Judy Garber, W. Greene, J. E. Beck

Purpose

The primary purpose of the Children’s Somatization Inventory (SCI) is to systematically quantify the occurrence and distress associated with various physical symptoms that are often persistent and lack a clear organic medical explanation. It is designed to serve as an efficient screening and assessment tool for identifying youth who exhibit significant symptoms of somatization.

In research, the scale is invaluable for investigating the relationship between psychological factors (such as anxiety, depression, and parental somatization) and physical complaints. Clinically, it aids in diagnosing and monitoring treatment outcomes for children presenting with functional disorders, including recurrent Chronic Abdominal Pain. The revised CSI-24 specifically focuses on symptoms relevant to the diagnostic criteria for Somatic Symptom Disorder and related conditions in youth populations.

Construct

The SCI measures the psychological construct of somatization, which is defined as the tendency to experience and report psychological distress through the manifestation of physical symptoms. The inventory operationalizes this construct by listing a wide range of common and less common physical complaints spanning multiple physiological systems, including gastrointestinal, pain, cardiopulmonary, and pseudo-neurological domains.

The total score derived from the SCI reflects the overall burden or frequency of these symptoms. Importantly, the scale aims to capture somatic complaints independent of known medical diagnoses, focusing instead on the subjective experience and reporting of physical distress that may be linked to underlying emotional or stress-related factors.

Validity

The validity of the SCI has been well-established across numerous pediatric samples. Construct validity is supported by the scale’s high correlation with other measures of functional impairment and emotional distress, such as anxiety and depression inventories. Studies have consistently shown that SCI scores are significantly elevated in clinical groups (e.g., patients with functional abdominal pain) compared to healthy controls or those with organic disease.

Furthermore, discriminant validity confirms the scale’s ability to differentiate between children whose pain is functionally mediated versus those whose pain is explained by a specific physical illness. The 2009 revision (CSI-24) focused on enhancing the psychometric properties and ensuring alignment with modern diagnostic classifications for somatic symptom disorders.

Reliability

The SCI exhibits excellent reliability, making it a trustworthy tool for clinical assessment. Measures of internal consistency (homogeneity) are consistently high, with Cronbach’s alpha coefficients for the CSI-24 typically ranging from 0.85 to 0.93 in diverse samples of children and adolescents. This suggests that the items reliably measure a single underlying construct of somatic symptom reporting.

Additionally, test-retest reliability has been demonstrated to be strong over periods of several weeks, indicating that the symptom scores are stable and consistent when no significant clinical changes or interventions have occurred. This stability is essential for monitoring symptom trajectories over time.

Factor Analysis

Early factor analyses of the original 37-item SCI often supported a structure dominated by a strong general factor, reflecting overall somatic symptom burden. However, some studies have suggested subscale structures, often grouping symptoms into categories such as Pain Symptoms, Gastrointestinal Complaints, and Pseudoneurological Symptoms.

The revised CSI-24 was developed to optimize the unidimensionality of the scale, and contemporary research generally supports using a single total score (Total Somatic Symptoms Score) for clinical decision-making, as the general factor accounts for the majority of the variance. This simplifies interpretation and maintains the scale’s utility as a global measure of somatization severity.

Instrument

Test Type: Self-Report Inventory

Format: Paper-and-pencil or electronic questionnaire using a 5-point Likert scale.

Language Available: English (and translated versions are available in multiple languages for research use).

Population Group: Children and Adolescents

Age Group: Typically utilized for youth aged 8 to 17 years.

Population Details: Used in both community samples and clinical populations, including pediatric patients presenting with chronic pain, recurrent abdominal pain, and other medically unexplained symptoms.

Test Methodology: Respondents rate how much they have been bothered by each symptom in the past two weeks 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 the responses, with higher scores indicating greater somatic symptom frequency and severity.

Keywords

Functional Pain, Medically Unexplained Symptoms, CSI-24, Self-Report, Psychological Assessment, Clinical Practice, Pediatrics, Recurrent Abdominal Pain, Symptom Severity

Authors

Author ORCID Identifier: N/A (Not provided in source material)

Affiliation Email addresses: N/A (Not provided in source material)

Correspondence Address: N/A (Not provided in source material)

Permissions & Fee and Test Year

The original Children’s Somatization Inventory (SCI) was introduced in 1991. The widely used, psychometrically enhanced revised form (CSI-24) was validated in 2009. The instrument is generally available for non-commercial research use upon request to the primary authors or through established academic channels, often requiring standard citation for use.

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 instrument can be found at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2722132/

Items of the Children’s Somatization Inventory (SCI)

• 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?

* items at CSI-24