Different properties of ACPA and IgM-RF derived from a large dataset: further evidence of two distinct autoantibody systems

Table 1 Correlations between autoantibody levels and markers of inflammation

	Erythrocyte sedimentation rate		C-reactive protein
Diagnosis group	ACPA	IgM-RF	ACPA	IgM-RF
RA (n = 1,130)	0.16^a	0.31^a	0.13^a	0.28^a
Non-RA (n = 1,190)	0.07^b	0.06	0.02	0.06

^aP < 0.01; ^bP < 0.05. ACPA, antibody to citrullinated proteins/peptides; IgM-RF, IgM rheumatoid factor; RA, rheumatoid arthritis.

ISSN: 1478-6362