Table 2 The amount of T4, T3, and TSH hormones based on two levels of fluoride in drinking water in cases and controls, YGA (Yazd Greater Area), 2017.

From: Impact of Drinking Water Fluoride on Human Thyroid Hormones: A Case- Control Study

Variable

Case median(IR)*

P Value

Control median(IR)*

P Value

0–0.29 mg/L

0.3–0.5 mg/L

0–0.29 mg/L

0.3–0.5 mg/L

T4

6.56 ± 2.2

7.6 ± 4.3

0.17

8.5 ± 1.2

8.6 ± 1.2

0.45

T3

115.3 ± 22

117.8 ± 36.6

0.19

135 ± 18.4

138.5 ± 21.6

0.026

TSH

11.85 ± 7

20.5 ± 12.8

0.003

2.2 ± 0.95

2.8 ± 0.9

0.001

  1. *IR, Interquartile range. The normal range for T3 hormone is (78–180 ng/dL). The normal range for T4 hormone is (5.5–12.5 μg/dL). The normal range for TSH hormone is (0.17–4.5 mlU/L).
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