Table 1.

Results of receiver operating curve analysis according to data summation

Duration of data processing	1-second	2-minute	4-minute	6-minute	8-minute	10-minute
Sensitivity	0.615	0.813	0.840	0.880	0.895	0.889
Specificity	0.936	0.888	0.912	0.886	0.866	0.901
PPV	0.945	0.932	0.947	0.936	0.926	0.954
NPV	0.575	0.715	0.752	0.796	0.816	0.778
Accuracy	0.730	0.839	0.865	0.882	0.885	0.893
AUC	0.785	0.906	0.921	0.932	0.938	0.942
Optimal cut-off score	1	76	161	185	243	313
DeLong’s test
D value (pvalue) in comparison of baseline data (1 second)	-	28.981 (< 0.001)	25.339 (< 0.001)	24.480 (< 0.001)	23.098 (< 0.001)	21.933 (< 0.001)
D value (pvalue) in comparison of 10-minute data	−21.933 (< 0.001)	−4.389 (< 0.001)	−2.359 (0.018)	−1.053 (0.293)	−0.481 (0.631)	-

PPV, positive predictive value; NPV, negative predictive value; AUC, area under the curve.