Table 3.

Values of urine ammonium and the four urine anion gap measurements in the total population and by tertiles of urine ammonium

Measurement, mEq/dTotal Population, n=1044Urine Ammonium Tertile 1 (Range, 0–15 mEq/d), n=348Urine Ammonium Tertile 2 (Range, 15–24 mEq/d), n=348Urine Ammonium Tertile 3 (Range, 24–81 mEq/d), n=348P Value
Urine ammonium21 (12)10 (3)19 (3)35 (9)
UAG42 (25)37 (25)42 (24)47 (26)<0.001
UAGSO413 (19)18 (18)14 (19)6 (19)<0.001
UAGPO420 (20)22 (20)21 (20)18 (19)0.05
UAGPLUS−9 (19)3 (15)−7 (16)−22 (18)<0.001
  • Values shown as mean (SD). —, not applicable; UAG, urine anion gap; UAGSO4, urine anion gap with inclusion of urine sulfate; UAGPO4, urine anion gap with inclusion of urine phosphate; UAGPLUS, urine anion gap with inclusion of urine phosphate and sulfate.