D-Dimer Combined with Fibrinogen Predicts the Risk of Venous Thrombosis in Fracture Patients

Table 3

The cutoff point and AUC of different ages.

ROC model	AUC				Cutoff point
	Area	Standard error	95% Wald confidence limits
D-dimer	0.7296	0.0086	0.7128	0.7464	424.89
D2-AgeQ1	0.7649	0.0196	0.7265	0.8032
D2-AgeQ2	0.7590	0.0181	0.7235	0.7944
D2-AgeQ3	0.6906	0.0197	0.6520	0.7293
D2-AgeQ4	0.6932	0.0141	0.6655	0.7208
Fibrinogen	0.5209	0.0106	0.5002	0.5417	3.543
Fib-AgeQ1	0.5228	0.0311	0.4618	0.5837
Fib-AgeQ2	0.5421	0.0232	0.4966	0.5876
Fib-AgeQ3	0.5631	0.0216	0.5208	0.6054
Fib-AgeQ4	0.5017	0.0169	0.4685	0.5349

AUC: area under the curve; D2: D-dimer; Fib: fibrinogen; Q1 (age ≤ 45), Q2 (45 < age ≤ 60), Q3 ((60 < age ≤ 70), and Q4 (age > 70);