Table 1.

Correlations between CP, PAD2, and PAD4 expression and synovial inflammation

	Mean lining thickness	Infiltration	Vascularity
Total CP	0.4 (< 0.05)	0.5 (< 0.001)	0.6 (< 0.001)
Intracellular CP	0.4 (< 0.05)	0.4 (0.001)	0.6 (< 0.01)
PAD2 (ROI002)	0.5 (< 0.05)	0.6 (< 0.001)	0.4 (< 0.05)
PAD2 (SN665)	0.6 (< 0.001)	0.7 (< 0.001)	0.5 (< 0.01)
PAD4 (SG1467)	0.6 (< 0.01)	0.3 (NS)	0.3 (NS)
PAD4 (SN823)	0.5 (< 0.01)	0.1 (NS)	0.2 (NS)

Values are expressed as Spearman rank correlation coefficients (P values). CP, citrullinated protein; NS, not significant.