Table 7. The prognostic value of a gradual change of prothrombin time over the 7th-day among COVID-19 patients attending the Tibebe Ghion Specialized Hospital, COVID-19 treatment center 2021 (n = 100).

Parameter	Prognosis category	AUC (95% CI)	Cut-off point	Sensitivity (%)	Specificity (%)	Youden Index
PT mean difference	Worse from others	0.93 (0.87–0.99)	≥ 0.65	100	79.3	0.793
	Good from others	0.75 (0.65–0.84)	≤ -0.4	78	64	0.42