Table 2.

Correlations between serum cytokine levels in RA were evaluated at baseline. Statistical significance of the correlation coefficient (r) was determined using Spearman’s rank correlation test (r > 0.3 or p < 0.05; data shown in bold type).

	IL-2		IL-6		IL-17A		IL-17F		IFN-α		TNF-α
	r	p	r	p	r	p	r	p	r	p	r	p
IL-1ß	0.431	< 0.001	0.029	0.828	0.296	0.021	0.319	0.013	0.068	0.610	0.659	< 0.001
IL-2			0.191	0.144	0.155	0.239	0.325	0.011	0.383	0.003	0.380	0.003
IL-6					0.040	0.763	0.068	0.610	0.024	0.862	0.024	0.862
IL-17A							0.072	0.584	0.435	< 0.001	0.010	0.938
IL-17F									0.415	0.001	0.295	0.022
IFN-α											0.274	0.037

RA: rheumatoid arthritis; IL: interleukin; IFN: interferon; TNF: tumor necrosis factor.