Table 3.

Classification statistics of the HDS in detecting HAND.

Cutoff score	Sensitivity	Specificity	PPV	NPV	Overall accuracy
3.0	0.045	1.000	1.000	0.548	1.045
3.5	0.068	0.980	0.750	0.549	1.049
4.0	0.091	0.980	0.800	0.556	1.071
4.5	0.114	0.961	0.714	0.557	1.074
5.0	0.136	0.961	0.750	0.563	1.097
5.5	0.159	0.961	0.778	0.570	1.120
6.0	0.227	0.941	0.769	0.585	1.168
6.5	0.295	0.902	0.722	0.597	1.197
7.0	0.341	0.843	0.652	0.597	1.184
7.5	0.386	0.804	0.630	0.603	1.190
8.0	0.409	0.784	0.621	0.606	1.193
8.5	0.500	0.706	0.595	0.621	1.206
9.0	0.568	0.706	0.625	0.655	1.274
9.5	0.682	0.686	0.652	0.714	1.368
10.0	0.682	0.667	0.638	0.708	1.348
10.5	0.682	0.627	0.612	0.696	1.309
11.0	0.705	0.608	0.608	0.705	1.312
11.5	0.773	0.510	0.576	0.722	1.283
12.0	0.795	0.510	0.583	0.743	1.305
12.5	0.864	0.451	0.576	0.793	1.315
13.0	0.886	0.431	0.574	0.815	1.318
13.5	0.886	0.333	0.534	0.773	1.220
14.0	0.909	0.275	0.519	0.778	1.184
14.5	0.977	0.196	0.512	0.909	1.173
15.0	0.977	0.157	0.500	0.889	1.134
15.5	1.000	0.078	0.484	1.000	1.078
16.0	1.000	0.059	0.478	1.000	1.059

Note. HDS = HIV Dementia Scale; PPV = Positive Predictive Value; NPV = Negative Predictive Value.