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Concurrent Validity and Reliability of the Pediatric Evaluation of Disability Inventory-Computer Adaptive Test Mobility Domain

Dumas, Helene M. PT, MS; Fragala-Pinkham, Maria A. PT, DPT, MS

Pediatric Physical Therapy:
doi: 10.1097/PEP.0b013e31824c94ca
Research Article

Purpose: To examine concurrent validity, item-specific reliability, and score distributions of the new Pediatric Evaluation of Disability Inventory-Computer Adaptive Test (PEDI-CAT) Mobility domain with the original PEDI Functional Skills (FS) Mobility Scale.

Methods: Thirty-five parents of children with neurodevelopmental disabilities completed the PEDI-CAT on a computer and the paper PEDI FS via interview.

Results: Strength of association between the PEDI-CAT Mobility domain and PEDI FS Mobility Scale scores was good to excellent (r = 0.82; P < .001). Intraclass correlation coefficients ranged from .3390 to 1.000, and agreement ranged from 60% to 100% for 8 specific items. No child had the minimum score on either test, whereas 9 children (26%) had a maximum score on the PEDI FS Mobility Scale.

Conclusions: This study provides evidence for potential users that the concurrent validity, reliability, and score distribution for the PEDI-CAT Mobility domain are adequate for use with children with varied diagnoses and throughout the pediatric age span.

In Brief

This initial study of the validity and reliability of the mobility domain of the new Computer Adaptive Test version of the PEDI demonstrates that this component of the test can be used with children with a variety of disabilities and in children and youth up to the age of 20 years.

Author Information

Research Center for Children with Special Health Care Needs, Franciscan Hospital for Children, Boston, Massachusetts.

Correspondence: Helene M. Dumas, PT, MS, Research Center, Franciscan Hospital for Children, 30 Warren St, Boston, MA 02135 (

Grant Support: This study was supported by a Clinical Research grant from the Section on Pediatrics, American Physical Therapy Association.

The authors declare no conflict of interest.

© 2012 Lippincott Williams & Wilkins, Inc.