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Patient-reported Outcomes Measurement Information System (PROMIS) for pediatrics is a validated patient-reported or parent-proxy-reported outcomes assessment tool used to evaluate health-related quality of life in children and adolescents with chronic medical conditions. The health-related quality of life of children with brachial plexus birth injury (BPBI) as measured by PROMIS is not well understood. We hypothesized that children with BPBI would report impaired upper extremity (UE) function but normal mobility, pain interference, and peer relationships co