Translations:Advanced Field Epi:Manual 1 - Disease Investigation/361/en

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The light shaded boxes show the differences in prevalence required for a sample size of approximately 10 animals per group. In particular, where the difference between cases and non-cases is large (top left corner), only small numbers of animals are required to provide a high level of confidence that the observed association is not due to chance. In contrast, very large numbers are required if the difference between groups is likely to be small (diagonal from bottom left to top right).