表 6. Sensitivity and specificity of postoperative D-dimer levels for diagnosing VTE.

术后D-dimer水平诊断VTE发生灵敏度及特异度

Postoperative D-dimer	PPV/%	NPV/%	Sensitivity/%	Specificity/%	Youden index/%
PPV: positive predictive value; NPV: negative predictive value.
0.50 mg/L	15.66	94.83	92.86	20.75	13.61
1.00 mg/L	18.30	90.91	66.67	52.83	19.50
1.25 mg/L	20.17	90.43	57.14	64.15	21.29
1.50 mg/L	24.73	91.12	54.76	73.58	28.34
1.625 mg/L	23.81	90.13	47.62	75.85	23.47
1.75 mg/L	27.78	90.64	47.62	80.38	28.00
2.00 mg/L	27.45	89.06	33.33	86.04	19.37