Table 3 Mean of TSH hormone according to different study variables, YGA (Yazd Greater Area), 2017.

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

Characteristics Case group Control group
N (%) Mean ± SD CI (95%) P Value N (%) Mean ± SD CI (95%) P Value
Gender
Male 38 (19.2) 19.32 ± 12.2 13–25.5 0.715a 88 (41.3) 2.5 ± 0.92 2.3–2.6 0.12a
Female 160 (80.8) 17.3 ± 11.82 14.3–20.2 125 (58.7) 2.6 ± 0.93 2.5–2.8
Marital statues
Married 165 (83.3) 18.62 ± 11.3 15.8–21.4 0.094a 175 (82.2) 2.53 ± 0.92 2.4–2.7 0.24a
Single 22 (11.1) 17.97 ± 14.8 6.7–29.3 29 (13.6) 2.65 ± 1 2.3–3
Divorced 2 (1) 8.7 ± 9.71 5.4–20.8 2 (0.4) 3.15 ± 1.5 2.3–3.4
Widow 9 (4.5) 9 ± 10.11 6.2–21.2 7 (3.3) 3.1 ± 0.4 2.7–3.4
Education
Primary 12 (6.1) 11.62 ± 5.4 4.5–20 0.452a 28 (13.1) 2.5 ± 0.8 2.18–2.81 0.442a
Elementary 82 (41.4) 20.2 ± 12.2 15.8–24.6 55 (25.8) 2.42 ± 0.86 2.2–2.7
Diploma 58 (29.3) 14.8 ± 13.48 8.5–21 102 (47.9) 2.6 ± 0.92 2.45–2.8
Graduate Diploma 15 (7.6) 15.9 ± 3.9 12.8–18.9 16 (7.5) 2.7 ± 1.2 2–3.5
B.Sc. 27 (13.6) 19 ± 13 10.5–27.8 12 (5.6) 2.7 ± 1.23 1.95–3.5
M.Sc. and higher 4 (2) 18.8 ± 12.7 11–26.9
Occupation
Self-employment 17 (8.6) 14.7 ± 2.4 8.6–20.7 0.894a 46 (21.6) 2.4 ± 0.95 2.1–2.7 0.445a
Housewife 131 (66.2) 17.2 ± 12.4 13.7–20.7 110 (51.6) 2.6 ± 0.89 2.5–2.8
University student 11 (5.6) 16 ± 4.9 9.9–22.1 8 (3.8) 2.8 ± 0.93 2–3.6
Employee 23 (11.6) 20.8 ± 14.2 13.3–28.4 22 (10.3) 2.7 ± 1.14 2.1–3.2
Unemployed 16 (8.1) 16.4 ± 1.9 14–18.7 27 (12.7) 2.46 ± 0.89 2.1–2.8
Age (year)
20–25 19 (9.6) 18.74 ± 11.1 10–27.2 0.465a 21 (9.9) 2.6 ± 0.96 2.2–3 0.253a
26–35 50 (25.3) 21.3 ± 13.3 15.5–27 56 (26.3) 2.7 ± 1 2.4–3
36–45 53 (26.8) 17.6 ± 14.7 10.3–24.9 54 (25.4) 2.4 ± 0.77 2.2–2.62
46–60 76 (38.4) 14.7 ± 8.1 11.7–17.8 82 (38.5) 2.6 ± 0.9 2.4–2.8
BMI
<18.5 12 (6.1) 21.7 ± 12.5 8.5–34.7 0.57a 10 (4.7) 2.8 ± 1.1 1.9–3.6 0.68a
18.5–24.9 52 (26.3) 16.7 ± 8.2 12.6–20.7 62 (29.1) 2.5 ± 0.88 2.3–2.7
25–29.9 77 (38.9) 18.3 ± 13 13.5–23.1 91 (42.7) 2.6 ± 0.98 2.4–2.8
30–39.9 53 (26.8) 16.7 ± 12.7 11.45–21.9 49 (23) 2.5 ± 0.86 2.3–2.8
>40 4 (2) 18.9 ± 12.7 13–22.9 1 (0.5)
Fluoride Level
0–0.29 mg/L 59 (29.8) 11.85 ± 7 8.9–14.8 0.003a 65 (30.5) 2.2 ± 0.95 1.9–2.4 0.001a
0.3–0.5 mg/L 139 (70.2) 20.4 ± 12.65 16.9–23.8 148 (69.5) 2.75 ± 0.88 2.6–2.9
  1. aKruskal-Wallis test.