Accuracy and precision of the Pediatric Evaluation of Disability Inventory computer-adaptive tests (PEDI-CAT)

Dev Med Child Neurol. 2011 Dec;53(12):1100-6. doi: 10.1111/j.1469-8749.2011.04107.x. Epub 2011 Nov 11.


Aim: The aims of the study were to: (1) build new item banks for a revised version of the Pediatric Evaluation of Disability Inventory (PEDI) with four content domains: daily activities, mobility, social/cognitive, and responsibility; and (2) use post-hoc simulations based on the combined normative and disability calibration samples to assess the accuracy and precision of the PEDI computer-adaptive tests (PEDI-CAT) compared with the administration of all items.

Method: Parents of typically developing children (n = 2205) and parents of children and adolescents with disabilities (n = 703) between the ages of 0 and 21 years, stratified by age and sex, participated by responding to PEDI-CAT surveys through an existing Internet opt-in survey panel in the USA and by computer tablets in clinical sites.

Results: Confirmatory factor analyses supported four unidimensional content domains. Scores using the real data post hoc demonstrated excellent accuracy (intraclass correlation coefficients ≥ 0.95) with the full item banks. Simulations using item parameter estimates demonstrated relatively small bias in the 10-item and 15-item CAT versions; error was generally higher at the scale extremes.

Interpretation: These results suggest the PEDI-CAT can be an accurate and precise assessment of children's daily performance at all functional levels.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural
  • Validation Study

MeSH terms

  • Activities of Daily Living / psychology*
  • Adolescent
  • Child
  • Child, Preschool
  • Diagnosis, Computer-Assisted / methods*
  • Disabled Children*
  • Female
  • Health Surveys
  • Humans
  • Male
  • Pediatrics / methods
  • Psychological Tests / standards*
  • Psychometrics / methods
  • Young Adult