Table 4.

Correlation of serum markers of thrombo-inflammation and iron parameters at early post-acute and long-term follow-up.

Serum Marker	Iron	TSAT 3	Ferritin	sTFR 4	sTFRF Index 5	Hepcidin
	60 days post-COVID-19 follow-up
CRP–ρ 1	−0.198 *	−0.272 **	0.040	0.175	0.095	−0.006
Procalcitonin–ρ	−0.085	−0.069	0.089	0.185	0.060	−0.012
IL6–ρ 2	−0.202 *	−0.161	0.067	0.272 **	0.213 *	−0.065
Neopterin–ρ	−0.185	−0.158	0.235 *	0.242 *	0.064	0.035
D-dimer–ρ	−0.248 *	−0.242 *	0.028	0.177	0.131	−0.191
	360 days post−COVID−19 follow−up
CRP–ρ 1	−0.335 **	−0.334 **	0.055	0.092	0.049	0.035
Procalcitonin–ρ	−0.196 *	−0.141	0.213 *	0.192 *	0.023	0.156
IL6–ρ 2	−0.329 **	−0.321 **	0.001	0.030	0.052	0.056
Neopterin–ρ	−0.235 *	−0.178	0.140	0.238 *	0.097	0.111
D-dimer–ρ	−0.121	−0.071	0.006	−0.049	−0.034	0.021

¹ C-reactive protein; ² interleukin-6; ³ transferrin saturation, ⁴ soluble transferrin receptor, ⁵ soluble transferrin receptor/log serum ferritin; N = 108, ρ = correlation coefficient rho according to Spearman rho calculation, * p < 0.05, ** p < 0.01.