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Fig. 3 | Environmental Health

Fig. 3

From: Thyroid hormone levels associate with exposure to polychlorinated biphenyls and polybrominated biphenyls in adults exposed as children

Fig. 3

Age of exposure interacts with PBB level to predict thyroid hormone levels. There was a significant interaction between age of exposure and total PBB level in predicting total T3 (p = 0.03) (a), free T3 (p = 0.002) (b), and the free T3: free T4 ratio (p = 0.01) (c). The interaction term was not significant for predicting total T4, free T4, and TSH. The interaction term in the model was built with two continuous variables, but in order to visualize the interaction, age of exposure was dichotomized around the median and plotted with PBB level on the x-axis and hormone level on the y-axis

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Environmental Health

ISSN: 1476-069X