To evaluate the validity and responsiveness of the PROMIS pediatric item banks with longitudinal assessments in 120 children ages 8-18 with JIA. Concurrent validity will be assessed by measuring corre
Column A = Gap (distance in mm), B = Age (gender), C = Delay (Months), D = Follow-up (Months), E = Birch Score, F = Motor function: (Before) After surgery, G = Sensory function: (Before)
