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Validation of the Abdominal Pain Index using a revised scoring method.

Kelsey T Laird1, Amanda L Sherman2, Craig A Smith2

  • 1Department of Psychology and Human Development, Vanderbilt University and Department of Pediatrics, Vanderbilt University lynn.walker@vanderbilt.edu.

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The Abdominal Pain Index (API) is a reliable and valid tool for assessing abdominal pain severity in children. Its revised scoring method allows for better comparisons across different groups and over time.

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Area of Science:

  • Pediatric Gastroenterology
  • Psychometrics
  • Clinical Assessment

Background:

  • Functional abdominal pain (FAP) is common in children, necessitating validated assessment tools.
  • Existing measures may lack robust psychometric properties or standardized scoring.
  • The Abdominal Pain Index (API) is a brief measure of abdominal pain severity.

Purpose of the Study:

  • To evaluate the psychometric properties of child and parent-report versions of the four-item Abdominal Pain Index (API).
  • To assess the reliability and validity of the API using a revised scoring method.
  • To determine the API's utility in children with functional abdominal pain (FAP) and healthy controls.

Main Methods:

  • A large cohort of pediatric patients (N=1,967) with FAP and healthy controls (N=172) completed the API.
  • Child and parent-report versions were administered at baseline and various follow-up points (2 weeks to 6 months).
  • Long-term follow-up assessments were conducted on subsets of participants.

Main Results:

  • The API demonstrated good concurrent, discriminant, and construct validity.
  • Internal consistency of the API was found to be good.
  • The revised scoring method facilitates score comparisons across samples and time.

Conclusions:

  • The Abdominal Pain Index (API) is a useful, reliable, and valid measure for assessing abdominal pain severity.
  • The revised scoring method enhances the API's utility for research and clinical practice.
  • The API is suitable for use in both pediatric FAP populations and healthy controls.