Table 4.
Patients separated by tertiles of urine phosphate/urine urea nitrogen ratio. Comparisons of age; glomerular filtration; total intake of phosphate; phosphate intake from animal, vegetable and inorganic sources; fractional excretion of phosphate; urine phosphate excretion per day.
| Variable | T1 (<58.9 mg/g) n = 24 |
T2 (58.9–71.1 mg/g) n = 23 |
T3 (>71.1 mg/g) n = 24 |
p |
|---|---|---|---|---|
| Age (years) | 62 ± 10 | 62 ± 8 | 61 ± 9 | 0.863 |
| GFR (CKD-EPI) (mL/min/1.73 m2) | 65 ± 23 | 66 ± 20 | 73 ± 19 | 0.441 |
| Total intake of P (mg/day) | 979.3 ± 348.5 | 1042.1 ± 355.2 | 1227.2 ± 347.3 | 0.047 |
| P intake from animal source (mg/day) | 628.5 ± 98.9 | 673.0 ± 726.2 | 726.2 ± 164.8 | 0.243 |
| P intake from vegetable source (mg/day) | 194.0 ± 98.9 | 257.3 ± 143.9 | 255.4 ± 137.2 | 0.185 |
| Inorganic P intake (mg/day) | 160.1 ± 211.1 | 113.4 ± 103.6 | 247.1 ± 253.1 | 0.038 |
| FeP (%) | 22.9 ± 12.3 | 24.1 ± 10.6 | 22.9 ± 6.8 | 0.653 |
| Urine P Excretion (mg/day) | 696.7 ± 237.2 | 770.1 ± 313.7 | 923.6 ± 356.1 | 0.049 |
FeP: fractional excretion of phosphate; GFR: glomerular filtration; P: phosphate; P/UUN ratio: phosphate/urine urea nitrogen ratio.