Table 3 Urinary volume, pH, solute concentrations, Ca/Cit ratio, and AP indexes in 12-h daytime and 12-h overnight urine samples of healthy and stone-forming adults
Healthy adults (n = 82) | Stone forming adults (n = 67) | |||||
|---|---|---|---|---|---|---|
12-h day | 12-h night | p-value | 12-h day | 12-h night | p-value | |
Volume (mL/12 h) | 870 (600–1165) | 650 (481–1010) | 0.001 | 920 (700–1200) | 780 (600–1135) | 0.071 |
Creatinine (mg/dL) | 940 (560–1310) | 1025 (670–1563) | 0.002 | 736 (562–1233) | 946 (553–1224) | 0.192 |
Calcium (mg/L) | 90 (72–161) | 133 (63–201) | 0.060 | 123 (84–167) | 142 (90–184) | 0.031 |
Magnesium (mg/L) | 52 (37–81) | 79 (50–109) | < 0.001 | 49 (38–68) | 68 (50–90) | < 0.001 |
Oxalate (mg/L) | 15 (11–19) | 16 (11–23) | 0.04 | 18 (14–24) | 21 (15–27) | 0.003 |
Phosphorous (mg/L) | 469 (353–683) | 651 (442–1085) | < 0.001 | 473 (314–622) | 581 (382–773) | < 0.001 |
Uric acid (mg/L) | 426 (278–556) | 372 (226–526) | 0.259 | 395 (263–499) | 338 (241–473) | 0.031 |
Citrate (mg/L) | 495 (315–754) | 408 (232–710) | 0.016 | 347 (223–531) | 324 (205–434) | 0.047 |
pH | 6.27 (5.95–6.71) | 5.64 (5.43–5.98) | < 0.001 | 6.12 (5.71–6.60) | 5.79 (5.49–6.16) | < 0.001 |
Ca/Cit (mg/mg) | 0.21 (0.15–0.30) | 0.25 (0.18–0.42) | < 0.001 | 0.34 (0.21–0.44) | 0.43 (0.26–0.64) | < 0.001 |
AP (CaOx) index | 0.64 (0.49–0.90) | 0.66 (0.46–1.13) | 0.057 | 1.10 (0.66–1.54) | 1.35 (0.90–1.84) | 0.001 |
AP (CaP) index | 4.85 (1.09–18.24) | 0.33 (0.06–2.49) | < 0.001 | 3.41 (0.36–15.30) | 0.93 (0.07–7.87) | 0.001 |