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. 2019 Apr 3;127(4):046001. doi: 10.1289/EHP4386

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EHP is an open-access journal published with support from the National Institute of Environmental Health Sciences, National Institutes of Health. All content is public domain unless otherwise noted.

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Figure 4 is a scatterplot showing studies carried out in places both in the USA and outside of the USA. It plots sample size (log scale) (y-axis) ranging between 1 to 100,000 across the five study designs (x-axis). — Sample size by epidemiological study type. Epidemiological studies are displayed in the scatterplot based on their study design on the x-axis (case–control, nested case–control, population-based case–control, cohort, or prospective cohort) and on the number of study participants on the y-axis (log scale). Studies conducted in the United States are shown as blue circles. Studies conducted outside of the United States are shown as light-teal triangles.