表 7. Sensitivity and specificity of preoperative-to-postoperative D-dimer change for diagnosing VTE.

术前术后D-dimer差值诊断VTE发生灵敏度及特异度

ΔD-dimer	PPV/%	NPV/%	Sensitivity/%	Specificity/%	Youden index/%
Δ: change; the other abbreviations are explained in the note to Table 6.
0.50 mg/L	15.17	88.37	64.29	43.02	7.31
1.00 mg/L	21.21	89.90	50.00	70.57	20.57
1.50 mg/L	27.66	88.85	30.95	87.17	18.12
2.00 mg/L	37.93	88.85	26.19	93.21	19.4
2.50 mg/L	44.00	89.01	26.19	94.72	20.91
3.00 mg/L	42.86	88.46	21.43	95.47	16.9