Elevated Serum IgG4 Defines Specific Clinical Phenotype of Rheumatoid Arthritis

Table 2

Comparison of autoantibodies of 67 RA patients between normal and elevated serum IgG4 groups.

Autoantibodies	Serum IgG4
	Elevated group	Normal group
	Rheumatoid factor (IU/mL)
At baseline			0.006
After treatment^#			0.011
Reduction range			0.005
Anti-CCP antibody (U/mL)
At baseline			0.006
After treatment			0.015
Reduction range			0.146

Mann-Whitney rank-sum test was used for comparison. Data were presented as mean ± standard deviation.
^#Autoantibodies were determined again at 6-month visit.
Reduction range = At baseline − After treatment.