Validation of the phenol red thread test in a Chinese population

BMC Ophthalmology

Table 5 The sensitivity, specificity, and Youden index based on each cutoff point of the ROC curve (Fig. 3)

PRT^a cutoff points (mm)	Sensitivity	Specificity	J^b
1.3333	1.000	0.000	0.000
2.5000	1.000	0.016	0.016
2.8333	0.978	0.032	0.010
3.1667	0.978	0.063	0.041
3.6667	0.978	0.079	0.057
4.0833	0.956	0.127	0.083
4.2500	0.956	0.143	0.098
4.5000	0.956	0.175	0.130
4.8333	0.956	0.190	0.146
5.0833	0.956	0.222	0.178
5.2500	0.956	0.238	0.194
5.5000	0.956	0.302	0.257
5.7500	0.956	0.365	0.321
5.9167	0.956	0.381	0.337
6.1667	0.889	0.413	0.302
6.5000	0.889	0.444	0.333
6.8333	0.889	0.492	0.381
7.0833	0.889	0.524	0.413
7.2500	0.889	0.540	0.429
7.4167	0.844	0.587	0.432
7.5833	0.844	0.603	0.448
7.8333	0.844	0.619	0.463
8.1667	0.822	0.651	0.473
8.5000	0.800	0.746	0.546
8.8333	0.778	0.778	0.556
9.1667	0.711	0.794	0.505
9.5000	0.689	0.857	0.546
9.8333	0.578	0.857	0.435
10.1667	0.467	0.873	0.340
10.5000	0.378	0.889	0.267
10.8333	0.356	0.905	0.260
11.1667	0.311	0.921	0.232
11.4167	0.289	0.937	0.225
11.5833	0.289	0.952	0.241
11.8333	0.267	0.968	0.235
12.3333	0.222	0.968	0.190
12.8333	0.200	0.984	0.184
13.3333	0.178	0.984	0.162
13.8333	0.156	0.984	0.140
14.3333	0.067	0.984	0.051
14.8333	0.044	1.000	0.044
16.0000	0.022	1.000	0.022
18.0000	0.000	1.000	0.000

ISSN: 1471-2415