CHI3L1 and rheumatoid arthritis: As shown in Figure 2B, the AUCs for CHI3L1 in the high/moderate/low/remission RA disease activity group based on DAS28-ESR were 0.71 (p=0.018), 0.83 (p<0.001), 0.76 (p=0.031), and 0.71 (p=0.006), respectively.