Table 1.

A numerical example of the three-stage sampling method

Feasible solution	Number of subgroups at the second stage	Size of group samples		Individual samples	Total number of test kits
		Stage 1	Stage 2	stage 3
Solution 1	2	64	32, 32	32	35
Solution 2	3	64	21, 21, 22	22	26
Solution 3	4	64	16, 16, 16, 16	16	21
Solution 4	5	64	12,13,13,13,13	13	19
Solution 5	6	64	10,10,11,11,11,11	11	18
Solution 6	7	64	9,10,10,10,10,10,10	10	18
Solution 7	8	64	8,8,8,8,8,8,8,8	8	17
Solution 8	9	64	7,7,7,7,7,7,7,7,8	8	18
Solution 9	10	64	6,6,6,6,6,6,7,7,7,7	7	18
Solution 10	11	64	5,5,6,6,6,6,6,6,6,6,6	6	18
Solution 11	12	64	5,5,5,5,5,5,5,5,6,6,6,6	6	19