CCL2 and synovitis: The percentages of low ultrasound grades (combined grade 0 and 1 synovitis) in the DAS28-CRP < 2.5 (46/61 = 75.4%), SDAI ≤ 3.3 (61/89 = 68.5%), and DAS28-MCP-1 < 2.2 (54/79 = 68.4%) groups (all belong to the remission subgroups) were compared with that in the DAS28-ESR < 2.6 group (65/98 = 66.3%) by means of odds ratios; no difference was identified.