Assessing mobility, upper extremity function, and pain interference in pediatric physical therapy: Psychometric properties of the PROMIS® item banks

Objectives To examine psychometric properties of three Dutch-Flemish pediatric and proxy PROMIS® item banks in pediatric physical therapy (PPT). Methods Children (8-18 years) attending PPT in the past year, and their parents, completed Dutch-Flemish PROMIS® Mobility, Upper Extremity, Pain Interference item banks (v2.0). Structural validity, internal consistency, reliability, test-retest reliability, known-group validity, comparability and child-parent agreement were assessed. Results 244 children and 361 parents participated. A third of the children (37.1%) had a chronic medical diagnosis. The physiotherapeutic goals of the children in our sample were related to musculoskeletal (57.3%), neurological (28.8%), gastrointestinal, endocrine, and/or hematological (0.8%), cardiovascular/respiratory (7.8%), mental health (2.5%), and behavioral (13.3%) conditions. Structural validity, internal consistency, test-retest reliability, comparability and child-parent agreement were sufficient. Children in PPT scored lower on all three PROMIS instruments compared to the general pediatric population (p