Fig. 4

The concentrations of YKL-40 (ng/mL) in patients without post-COVID syndrome (group 1) at admission to hospital (visit 1) and after 6-months of observation (visit 2) *p value < 0.05.

The concentrations of YKL-40 (ng/mL) in patients without post-COVID syndrome (group 1) at admission to hospital (visit 1) and after 6-months of observation (visit 2) *p value < 0.05.