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Figure 1 | Emerging Themes in Epidemiology

Figure 1

From: Sampling strategies to measure the prevalence of common recurrent infections in longitudinal studies

Figure 1

Sample sizes per arm for different sampling intervals. Longer intervals mean fewer simulated visits (sampling interval of 1 day means 365 visits, sampling interval of 28 days means 13 visits).Model A assumes that disease days are distributed completely at random;Model B assumes that diarrhoea occurs in episodes (as shown in Figure 3.2);Model C assumes (in addition toB) clustering of episodes in high risk individuals;Model D assumes (in addition toC) correlation between incidence and episode duration.

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