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Available plasma/serum values of patients plotted against their age. (A) Hypermagnesemia is most pronounced in children and decreases with age. (B) Plasma/serum potassium levels decline with age, revealing a marked hypokalemia in adolescence. The only exception is the patient group examined by Klar et al [40]. Values were partly obtained by conversion into mmol/L. The publication by Bongers et al. provided data points of the same patients at different ages [38].
