Elevated CRP levels at JIA diagnosis were most frequently noted in RF-positive disease (n = 11/11 [100%]), followed by the sJIA category (n = 53/60 [88%]), RF-negative disease (n = 53/73 [73%]), ERA (n = 65/113 [58%]) and oligoarthritis category (n = 99/191 [52%]; 61% in eoJIA vs 48% in poJIA). Here, CRP is linked to juvenile idiopathic arthritis.