Vietnamese Version of the Pediatric Evaluation of Disability Inventory (vPEDI): A Rasch Model Application

To explore the psychometric properties of the Vietnamese Pediatric Evaluation of Disability Inventory (vPEDI) using Rasch analysis.

403 Vietnamese children aged 0.5 to 7.5 years with typical development were evaluated by the vPEDI. The Andrich Rating Scale model (RSM) using WINSTEPS was utilized to analyze the construct validity, internal consistency, and precision of the vPEDI, particularly the Functional Skills Scale (FSS) and Caregiver Assistance Scale (CAS) subscales. A keyform ability map was generated to illustrate an example of the item-level hierarchy of the self-care domain in the FSS.

The vPEDI showed strong item-level psychometric properties for both the FSS and CAS under RSM. Ninety-five to 98.5% of items fit the three domains in the FSS, and 87.5 to 100% of items fit the three domains in the CAS. A keyform ability map for a child with a middle self-care ability in the FSS showed a clear pattern, where the child's transition between capable and unable items represented their ability level.

The vPEDI provided a valid, reliable, and precise measure of the functional capacity and performance for typically developing children in Vietnam, with few misfitting items.