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The quality of water analyzed in 60 locations for hardness, magnesium and iodine, for its possible relationship with essential hypertension, ignored in case-control models, and for its relationship with mortality due to cardiovascular diseases. The study of the independence between each of the variables and the number of unknown hypertense persons shows a statistically significant association. For each of the factors, an estimate was made of the relative risk and the etiological fraction in the displays, with their confidence intervals. The highest degree of association was with low concentrations of magnesium, associated with a risk of hypertension which was 3.61 times greater. The association holds for deaths due to cardiovascular diseases, only for hardness and magnesium.
