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).