Table 6.

Sensitivity and Specificity for HIV Risk Algorithm Cut-Points (Range: 1-74) (n = 8,898)

	All MSM	HIV Positives				HIV Negatives
Cut Point	% greater than or equal to Cut-Point	n	Number of HIV Infections per 100 Person-Years	Number greater than or equal to Cut-Point*	Sensitivity % greater than or equal to Cut-Point	n	Number greater than or equal to Cut-Point*	1-Specificity % greater than or equal to Cut-Point
1	100.0%	0	0.00	362	100.0%	158	8,536	100.0%
2	98.2%	13	0.53	362	100.0%	1306	8,378	98.1%
3	83.4%	32	1.11	349	96.4%	1581	7,072	82.8%
4	65.3%	47	2.04	317	87.6%	1240	5,491	64.3%
5	50.8%	36	1.94	270	74.6%	1010	4,251	49.8%
6	39.1%	22	1.75	234	64.6%	701	3,241	38.0%
7	30.9%	18	1.97	212	58.6%	523	2,540	29.8%
8	24.8%	29	3.25	194	53.6%	466	2,017	23.6%
9	19.3%	22	3.98	165	45.6%	323	1,551	18.2%
10	15.4%	19	4.28	143	39.5%	235	1,228	14.4%
11	12.6%	14	4.61	124	34.3%	167	993	11.6%
12	10.5%	22	9.52	110	30.4%	145	826	9.7%
13	8.6%	14	7.23	88	24.3%	107	681	8.0%
14	7.3%	10	5.03	74	20.4%	88	574	6.7%
15	6.2%	9	6.80	64	17.7%	76	486	5.7%
16	5.2%	7	5.68	55	15.2%	70	410	4.8%
17	4.4%	5	4.33	48	13.3%	63	340	4.0%
18	3.6%	7	7.41	43	11.9%	49	277	3.2%
19	3.0%	7	11.79	36	9.9%	35	228	2.7%
20	2.5%	3	5.25	29	8.0%	26	193	2.3%
21	2.2%	4	5.44	26	7.2%	37	167	2.0%
22	1.7%	1	5.02	22	6.1%	11	130	1.5%
23	1.6%	5	13.42	21	5.8%	20	119	1.4%
24	1.3%	2	11.53	16	4.4%	10	99	1.2%
25	1.2%	0	0.00	14	3.9%	8	89	1.0%
26	1.1%	3	24.14	14	3.9%	7	81	0.9%
27	1.0%	2	15.66	11	3.0%	9	74	0.9%
28	0.8%	1	9.92	9	2.5%	6	65	0.8%
29	0.8%	0	0.00	8	2.2%	8	59	0.7%
30	0.7%	1	11.24	8	2.2%	5	51	0.6%
31	0.6%	0	0.00	7	1.9%	4	46	0.5%
32	0.6%	0	0.00	7	1.9%	6	42	0.5%
33	0.5%	1	51.28	7	1.9%	2	36	0.4%
34	0.4%	0	0.00	6	1.7%	7	34	0.4%
35	0.4%	1	55.87	6	1.7%	2	27	0.3%
36	0.3%	0	0.00	5	1.4%	1	25	0.3%
37	0.3%	1	13.30	5	1.4%	5	24	0.3%
38	0.3%	0	0.00	4	1.1%	2	19	0.2%
39	0.2%	0	0.00	4	1.1%	0	17	0.2%
40 or above	0.2%	4	11.11	4	1.1%	17	17	0.2%
Total		362				8,536

^*Calculated by subtracting the cumulative sum before that row from the total for each category