Table 3.

Spearman rank correlations between baseline laboratory test findings in postmenopausal women with rheumatoid arthritis

Test	TNF-α	IL-1Ra	IL-6	sIL-6R	IGF-1	ESR	Estradiol
Serum TNF-α (pg/ml)	–	0.259*	0.041	0.346**	-0.128	0.135	-0.042
Serum IL-1Ra (pg/ml)	0.259*	–	0.338**	0.434***	-0.021	0.108	0.088
Serum IL-6 (pg/ml)	0.041	0.338**	–	0.261*	-0.245*	0.470***	0.116
Serum sIL-6R (pg/ml)	0.346**	0.434***	0.261*	–	-0.207	0.115	0.145
Serum IGF-1 (ng/ml)	-0.128	-0.021	-0.245*	-0.207	–	-0.177	0.014
ESR (mm)	0.135	0.108	0.470***	0.115	-0.177	–	0.015
Serum estradiol (pmol/l)	-0.042	0.088	0.116	0.145	0.014	0.015	–

*P < 0.05, **P < 0.01, ***P < 0.001. ESR = erythrocyte sedimentation rate; IGF-1 = insulin-like growth factor 1; IL-1Ra = IL-1-receptor antagonist; sIL-6R = soluble IL-6 receptor; TNF-α = tumor necrosis factor α.