Fig. 4

Kaplan-Meier analysis indicates that highly elevated HE4 levels were related to a higher rate of 30-day mortality. Cut-off value (≥ 331.7 pmol/L) was determined by the ROC-curve analysis. There was a lower risk of death for those COVID-19 subjects who had less than 331.7 pmol/L of HE4 level before treatment. Number of patients at risk are displayed at given days. Log rank P value was determined