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The most up-to-date and comprehensive source for studies on fluoride's multifaceted effects on human and animal health, with 100+ years of research organized by health category, type of study, author, journal, and date.
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Excessive iodine intake, water chemicals and endemic goitre in a Sudanese coastal area

September 2013 | Public Health Nutrition | Medani AM, Elnour AA, Saeed AM. | 16(9):1586-92.
Table 2 shows the correlation between various clinical indicators of thyroid function in schoolchildren and the concentration of water chemicals in Port Sudan. It indicates that thyroid hormones (T3 and T4) were poorly correlated with the concentration of water chemicals. TSH was significantly correlated with F– concentration (r=0.506, P=0.004) and inversely correlated with Ca2+ concentration (r=-0.506, P=0.004) and hardness (r=-0.506, P=0.004).