Table 2.

Arterial thromboembolism risk stratification and predictive performance.

	Number of patients (%)	Risk of ATE (%)	Sensitivity	Specificity	PPV	NPV	Odds ratios vs low risk
Derivation cohort
Low risk (0-8)	1431 (40.6%)	4.5	–	–	–	–	–
Intermediate risk (9–13)	1909 (54.1%)	20.1	0.86	0.47	0.20	0.96	5.36
High risk (14+)	186 (5.3%)	53.8	0.61	0.94	0.54	0.96	24.84
Validation cohort
Low risk (0–8)	748 (31.3%)	2.4	–	–	–	–	–
Intermediate risk (9–13)	1375 (57.5%)	12.8	0.91	0.38	0.13	0.98	5.95
High risk (14+)	269 (11.2%)	33.8	0.83	0.80	0.34	0.98	20.73

ATE, arterial thromboembolism; NPV, negative predictive value; PPV, positive predictive value.