Table 3. Correlation between expression levels of MDL-1 and disease activity parameters as well as cytokine levels in 38 patients with rheumatoid arthritis.

Parameters	MDL-1 expression on monocytes	MDL-1 mRNA levels on PBMCs	MDL-1 protein levels on SM
DAS28	0.392*	0.428**	0.613***
CRP, mg/dl	0.289*	0.395*	0.596**
Erosion score	0.569**	0.641***	0.546**
JSN score	0.476**	0.484**	0.393*
IL-1β, pg/ml	0.437**	0.274*	0.389*
IL-6, pg/ml	0.468**	0.387*	0.410*
IL-17A, pg/ml	0.262*	0.280*	0.135
TNF-α, pg/ml	0.605***	0.459**	0.321
DAP12 mRNA levels on PBMCs	0.656***	0.702***	0.447*
DAP12 protein levels on SM	0.119	0.207	0.462**

MDL-1: Myeloid DAP12-associated lectin-1; DAP12: DNAX adaptor protein 12; PBMCs: peripheral blood mononuclear cells; SM: synovial membranes; DAS28: disease activity score for 28-joints; CRP: C-reactive protein; JSN score: joint space narrowing score; IL-1β: interleukin-1β; IL-6: interleukin-6; IL-17A: interleukin-17A; TNF-α: tumor necrosis factor-α.

^*p<0.05, **p<0.005, ***p<0.001 were obtained by the nonparametric Spearman’s correlation test.