PFDA and Thyroid Hormones in Infants

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a. Two studies are not displayed on the figure because they used a different effect estimate type (Yang et al., 2016) or only presented quantitative results for significant associations (Berg et al., 2016). Neither reported an association between PFDA exposure and T4.

b. Regression coefficients are expressed as the increase in thyroid hormone levels per 1 ng/mL unit increase in exposure unless otherwise noted.