Table 3.

Sensitivity, specificity, and Youden J index values according to TST induration size

TST induration diameter (mm)	Sensitivity	Specificity	Youden's J index
4.50	0.702	0.586	0.288
5.50	0.660	0.724	0.384
6.50	0.660	0.862	0.522
7.50	0.596	0.897	0.492
8.50	0.532	0.931	0.463
9.50	0.489	0.966	0.455
10.50	0.404	0.966	0.370
11.50	0.340	1.000	0.340
12.50	0.298	1.000	0.298

Abbreviation: TST, Tuberculin skin test.