Table 2.

Baseline chemokine levels in seropositive and seronegative RA patients. Values are presented as mean with standard deviation. P values were determined by Wilcoxon ranked sum test

	IgM RF+ (n = 16)	IgM RF- (n = 13)	p value
CXCL10 (pg/ml)	510.2 ± 465.2	400.4 ± 525.3	0.16
CXCL13 (pg/ml)	371.6 ± 649.0	40.3 ± 55.6	0.02*
CCL20 (pg/ml)	9.7 ± 10.3	23.8 ± 30.5	0.09
	Anti-CCP+ (n = 15)	Anti-CCP- (n = 14)	p value
CXCL10 (pg/ml)	557.3 ± 458.0	357.8 ± 512.9	0.02*
CXCL13 (pg/ml)	396.6 ± 663.8	37.2 ± 54.4	0.005*
CCL20 (pg/ml)	9.6 ± 9.9	22.9 ± 29.7	0.12

IgG immunoglobulin G, RF rheumatoid factor, CXCL10 C-X-C motif chemokine 10, CXCL13 C-X-C motif chemokine 13, CCL20 C-C motif chemokine 20, anti-CCP anti-cyclic citrullinated peptide

*p < 0.05