Patient characteristics and baseline urinary parameters.

Abbreviations: M = male; F = female; SDS = standard deviation score; UOsm = urine osmolarity, UCreat = urine creatinine, UUN = urine urea nitrogen; FeNa = fractional excretion of sodium; FeK = fractional excretion of potassium; FeCl = fractional excretion of chloride; FeCa = fractional excretion of calcium; UCa/UCreat = urinary calcium:creatinine ratio; UMg/UCreat = urinary magnesium:creatinine ratio; TRP = tubular reabsorption of phosphorus; FeUA = fractional excretion of uric acid; UGluc/UCreat = urinary glucose:creatinine ratio; UProt/UCreat = urinary protein:creatinine ratio.(*)numbers indicate the presenting symptom or finding.