Table 5.

Analysis of the predictive value of D-dimer for LEDVT

	Optimal critical value	Sensitivity	Specificity	Positive predictive value	Negative predictive value	Area under ROC curve	95 % confidence interval
The level of D-dimer in patients with PICC	0.675	48.28 %	86.05 %	55.22 %	82.35 %	0.657	0.549–0.765
The level of D-dimer in patients without PICC	0.665	72.01 %	75.89 %	36.82 %	93.25 %	0.800	0.769–0.830

Note: PICC refers to peripherally inserted central venous catheter; LEDVT lower extremity deep venous thrombosis; ROC receiver operating characteristic curve