Psychometric properties of the Pediatric Evaluation of Disability Inventory - Patient Reported Outcome: A cognitively accessible measure of functional performance.

Participants were recruited by convenience, so the sample may not represent all young people with developmental disabilities. Disability category and IQ were not verified for all participants, and 3.9% gave no specific disability category. Two participants had recorded IQ scores below 35, so usability for people with very significant support needs is not established. The study did not test whether scores change after therapy or the smallest change that would be clinically meaningful. The groups used to check gender, age, and race/ethnicity differences were not large enough by the study's own criteria. Three gender-performance daily activity items were skipped by many participants and were removed from the scored daily activity domain.

Do not read this as proof that the PEDI-PRO can measure therapy change. The study checked whether the self-report scores held together and behaved similarly across groups, but it did not test whether scores change after therapy or the smallest clinically meaningful change.