Table 3. Sensitivity and specificity rates and Youden’s index for cutoff scores

Cutoff score	Sensitivity	Specificity	* Youden’s index
13	0.991	0.202	0.193
14	0.991	0.258	0.249
15	0.991	0.326	0.317
16	0.991	0.674	0.665
17	0.972	0.843	0.815
18	0.917	0.921	0.838
19	0.787	0.978	0.765
20	0.602	1	0.602

Youden’s index = Sensitivity + Specificity - 1.