Table 2.

The associations between disease activity, serum cytokine levels, and ferritin levels.

	Global VAS, r s	Pulmonary VAS, r s
IL-1β	−0.09	−0.03
IL-2	−0.01	0.06
IL-4	−0.04	0.31
IL-6	0.47**	0.33
IL-8	0.51**	0.45**
IL-10	0.50**	0.46**
IL-12	0.05	0.11
IL-13	−0.05	−0.01
IL-17	0.17	−0.05
IL-18	0.53**	0.34*
TNF-α	0.39*	0.45**
IFN-α	−0.03	−0.03
IFN-γ	0.20	0.11
IP-10	0.44*	0.33*
Ferritin	0.50*	0.62***

Statistical analyses were performed using Spearman's rank correlation coefficient.

P values are as indicated below. *P < 0.05,  **P < 0.01, and ***P < 0.001.

VAS: visual analogue scale and IP-10: interferon γ-inducible 10-kd protein.