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. 2020 Dec 24;765:144251. doi: 10.1016/j.scitotenv.2020.144251

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Fig. 4 — Summary of total test groups and populations at each risk and test level. Total test population size refers to the total number of people tested in a group. Total test # refers to the total number of tests needed for the corresponding number of people in the testing group. Sample #% refers to the percent sampled by Group. Numbers on horizontal axes indicate the disease risk of %. Numbers on vertical axes indicate the total number of people in the testing group. A. The total number of people tested and the total number of tests for risk between 1% and 10%. B. The total number of tested people and the total number of tests for risk between 0.1% and 0.9%. C. The total number of tested people and the total number of tests for risk between 0.01% and 0.09% when using three levels of tests. D. The total number of tested people and the total number of tests for risk between 0.01% and 0.09% when using four levels of tests. E. Percentage of samples based on different grouping strategies.