Venous thromboembolism risk assessment of surgical patients in Southwest China using real-world data: establishment and evaluation of an improved venous thromboembolism risk model

Table 3 Comparison of sensitivity, specificity, Youden's index, PPV and NPV on prospective test set

Scenario	Model	Threshold	Sensitivity	Specificity	Youden’s index	PPV	NPV
High sensitivity	Caprini	5	0.867	0.501	0.368	0.016	0.998
	SW	0.006	0.837	0.656	0.493	0.022	0.998
	RF	0.005	0.867	0.665	0.532	0.023	0.998
Optimal Youden's index	Caprini	7	0.578	0.794	0.372	0.025	0.995
	SW	0.008	0.667	0.861	0.527	0.042	0.996
	RF	0.009	0.770	0.796	0.567	0.034	0.997
High specificity	Caprini	9	0.289	0.930	0.219	0.037	0.993
	SW	0.020	0.356	0.928	0.283	0.043	0.994
	RF	0.016	0.363	0.931	0.294	0.046	0.994

Threshold, the discriminative threshold above which the patients is predicted to be “positive”; SW, SW-model; RF, random forest

ISSN: 1472-6947