Table 2.

Performance of the IPBSS scoring system at various cut-off values.

IPBSS score	Sensitivity	Specificity	Youden index
16.5	0.872	0.443	0.315
17.5	0.844	0.479	0.323
18.5	0.826	0.508	0.334
19.5	0.802	0.554	0.356
20.5	0.774	0.581	0.355
21.5	0.745	0.608	0.353
22.5	0.728	0.644	0.372
23.5	0.713	0.678	0.391
24.5	0.69	0.702	0.392
25.5	0.676	0.724	0.400
26.5	0.646	0.741	0.387
27.5	0.62	0.763	0.383
28.5	0.583	0.794	0.377
29.5	0.561	0.801	0.362
30.5	0.523	0.809	0.332
31.5	0.49	0.826	0.316