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Excessive iodine intake, water chemicals and endemic goitre in a Sudanese coastal area

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).