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Urine excretion of the components of gastrointestinal anion levels versus age hexile. Triangles, men; circles, women. Filled symbols are urinary sodium (UNa), urinary phosphate (UPhos) × 1.8, and urinary calcium (UCa); open symbols are urinary chloride (UCl), urinary potassium (UK), and urinary magnesium (UMg). All values are in meq·day−1·1.73 m−2 body surface area. Dashed lines are for visual clarity only and imply no interposed information.
