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. 2019 Jun 6;127(6):067006. doi: 10.1289/EHP4093

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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 3 is a box and whisker plot, plotting relative source contribution of tap water(ranging from 0 to 150 percent at increments of 50) (y-axis) for PFOA, PFNA, nPFOS, brPFOS, and PFHxS (x-axis). Years in current residence are: less than 2, 2 to 4, 4 to 14, and greater than 14. — Estimated relative source contribution (RSC) of tap water to overall PFAS exposure using a one-compartment toxicokinetic model. The dashed line represents the default RSC (20%) used in risk assessment to derive drinking water advisory levels. The upper panel shows the RSC among 110 Nurses’ Health Study (NHS) participants in 1989–1990. The lower-panel shows the RSC stratified by number of years at the same residential location. Box and whisker plots show the fifth, 25th, 50th, 75th and 95th percentiles among each group. Individual estimates are denoted by gray dots with small random variation added to their horizontal position for better separation. All data used to generate this figure are provided in Tables S8 and S9.