F2 and COVID-19: COVID-19 severity was associated with the maximum, minimum, and average prothrombin time (P values: 0.013, 0.016, and 0.010, respectively); the maximum, minimum, and average international normalized ratio (P values: 0.014, 0.026, and 0.014, respectively); and the maximum activated partial thromboplastin time (P = 0.016).