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Fig. 1 | Environmental Health

Fig. 1

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

Fig. 1

Correlation of thyroid hormone levels. The different thyroid hormone levels measured in this cohort were correlated with each other, and clustered so that the most correlated hormone levels are together (numbers are Pearson’s correlation coefficient). TSH was negatively correlated with the rest of the thyroid hormones, as expected since it is negatively regulated by them, and positively correlated with the free T3: free T4 ratio. Total and free T4 were moderately correlated, as were total and free T3. Total T4 was positively correlated with both total and free T3. Free T4 had a weak correlation with both total and free T3. The free T3: free T4 ratio is positively associated with total and free T3, but was negatively associated with total and free T4 (as expected). All correlations were statistically significant except for the association of total T3 with free T4 and TSH (p < 0.05)

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