Table 2.

Characteristics of laboratory variables in patients without post-COVID (group 1) and patients with post-COVID syndrome (group 2) during 6 months follow-up (visit 2).

Variables on follow-up visit (6 months after treatment)	Group 1 patients without post-COVID	Group 2 patients with post-COVID	p-value group 1 vs. group 2 (visit 2)
Leukocytes, µL-1 (median, range)	7.81 (3.35–15.81)	6.05 (4.04–10.73)	0.077
p value (visit 1 vs. visit 2)	0.020	0.300
Platelets, x 1000 µL-1 (median, range)	367 (142–489)	223 (126–412)	0.004
p value (visit 1 vs. visit 2)	0.004	0.124
C-reactive protein, mg/dl (median, range)	1.69 (1.00-93.7)	2.05 (0.86–29.2)	0.649
p value (visit 1 vs. visit 2)	0.009	0.012
Procalcitonin, (median, range)	0.23 (0.02–0.25)	0.05 (0.04–0.05)	0.628
p value (visit 1 vs. visit 2)	0.003	0.654
Ferritin µg/L, (median, range)	367.5 (12-1031)	292.75 (9.6–2556)	0.862
p value (visit 1 vs. visit 2)	0.161	0.441
IL-6 pg/ml, (median, range)	7.95 (1.5–15.8)	2.25 (1.5-634.5)	0.570
p value (visit 1 vs. visit 2)	0.108	0.236

Abbreviations: COVID-19 - Coronavirus disease 19, IL-6 – interleukin 6.