Figure.
The rate of thrombotic and thromboembolic events stratified using a 6-level ordinal scale to assess the clinical course of COVID-19. Scores on the ordinal scale were defined as follows6: a score of 1 indicated not hospitalized; 2, hospitalized and not receiving supplemental oxygen; 3, hospitalized and receiving supplemental oxygen; 4, hospitalized and receiving oxygen supplementation administered by a high-flow nasal cannula or noninvasive ventilation; 5, hospitalized and receiving mechanical ventilation; and 6, death. Wilson confidence interval calculation for binomial proportions was used to estimate the 95% confidence intervals for each point estimate.