Figure 2

ROC curve comparing discriminatory utility of predictive metrics for persistent inflammatory arthritis. Receiver operator characteristic (ROC) curve illustrating the discriminatory utility of two risk metrics, derived excluding or incorporating musculoskeletal ultrasound (MSUS) parameters, with respect to an outcome of PIA ("No MSUS" and "MSUS" respectively; area under both curves 0.91; SEM 0.015; P < 0.001).