CRP and synovitis: The number of joints showing synovitis on US at baseline was positively correlated with CRP (P<0.001, Figure 1A), ESR (P=0.002, Figure 1B), number of joints with active disease (P<0.001, Figure 1C), number of joints with limited range of motion (P<0.001, Figure 1D), physician's global assessment of disease activity (P<0.001, Figure 1E), parent/patient global assessment of overall well-being (P<0.001, Figure F), and CHAQ score (P<0.001, Figure 1G).