Figure 4

ROC curve comparing discriminatory utility of predictive metrics for RA amongst PIA sub-cohort. Receiver operator characteristic (ROC) curve illustrating the discriminatory utility of two risk metrics derived amongst the PIA sub-cohort alone, excluding or incorporating musculoskeletal ultrasound (MSUS) parameters, with respect to an outcome of rheumatoid arthritis (RA) ("No MSUS" and "MSUS" respectively). Area under curves: 0.93 (No MSUS; SEM 0.021; P < 0.001), 0.89 (MSUS; SEM 0.025; P < 001).