Table 4.

The ROC results of different factors

Risk Factors	Cut-off valuea	Sensitivity	Specificity	NPV	PPV	AUC	95% CI	SE	P-value
Gender	–	0.730	0.425	0.787	0.351	0.578	0.501–0.654	0.039	0.054
Age (years)	84.5	0.446	0.776	0.767	0.458	0.649	0.575–0.723	0.038	< 0.001
Time from injury to admission (days)	1.5	0.608	0.724	0.813	0.484	0.674	0.598–0.750	0.039	< 0.001
Fibrinogen(g/L)	4.89	0.432	0.828	0.744	0.516	0.644	0.569–0.719	0.038	< 0.001
D-dimer (μg/ml)	5.04	0.797	0.557	0.837	0.378	0.679	0.612–0.746	0.034	< 0.001
New predictor	12.74	0.919	0.667	0.951	0.540	0.852	0.806–0.898	0.023	< 0.001

^aThe cut-off points of scores were determined by the Youden index