Table 3.

Total number of tests in population with different risk ratio at level 1 and 2.

Sample size at level 1	Disease risk %	Risk for 2nd positive	Probability for 3rd positive sample	Group # at level 2	Sample size at level 2	Total test population size	Total test #
6	10	0.111111	0.111111	2	3	12	7
7	9	0.098901	0.098901	2	3.5	14	8
8	8	0.086957	0.086957	2	4	16	8
9	7	0.075269	0.075269	2	4.5	18	9
10	6	0.06383	0.06383	3	4	20	9
13	5	0.052632	0.052632	3	4	26	9
16	4	0.041667	0.041667	4	5	32	10
22	3	0.030928	0.030928	4	5	44	10
33	2	0.020408	0.020408	10	3	66	14
66	1	0.010101	0.010101	19	3	132	23
74	0.9	0.009082	0.009082	21	3	148	25
83	0.8	0.008065	0.008065	21	3	166	25
95	0.7	0.007049	0.007049	22	3	190	26
111	0.6	0.006036	0.006036	23	3	222	27
134	0.5	0.005025	0.005025	26	3	268	28
167	0.4	0.004016	0.004016	27	3	334	29
223	0.3	0.003009	0.003009	28	3	446	32
335	0.2	0.002004	0.002004	34	3	670	38
671	0.1	0.001001	0.001001	51	3	1342	55
745	0.09	0.000901	0.000901	54	3	1490	58
1000	0.05	0.0005	0.0005	67	3	2000	71
1000	0.01	0.0001	0.0001	67	3	2000	71