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Table 4 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 children

From: Effect of sample time on urinary lithogenic risk indexes in healthy and stone-forming adults and children

  Healthy children (n = 87) Stone forming children (n = 21)
12 h day 12 h night p-value 12 h day 12 h night p-value
Volume (mL/12 h) 480 (378–708) 360 (300–450) < 0.001 650 (335–930) 530 (315–705) 0.192
Creatinine (mg/dL) 908 (686–1250) 1162 (835–1469) < 0.001 886 (507–1393) 1000 (611–1097) 0.274
Calcium (mg/L) 57 (38–99) 86 (41–167) < 0.001 181 (57–209) 150 (101–258) 0.082
Magnesium (mg/L) 77 (54–110) 151 (110–198) < 0.001 79 (51–100) 128 (55–163) 0.021
Oxalate (mg/L) 20 (15–27) 26 (19–34) < 0.001 24 (20–32) 27 (23–37) 0.244
Phosphorous (mg/L) 630 (430–872) 1060 (804–1414) < 0.001 450 (337–664) 870 (480–1094) 0.001
Uric acid (mg/L) 597 (431–720) 529 (373–632) 0.002 454 (266–646) 396 (271–578) 0.244
Citrate (mg/L) 557 (405–737) 462 (328–668) < 0.001 379 (250–710) 299 (208–477) 0.004
pH 6.60 (6.15–6.96) 5.79 (5.60–6.22) < 0.001 6.36 (6.08–7.12) 5.91 (5.55–6.23) 0.001
Ca/Cit (mg/mg) 0.11 (0.07–0.17) 0.21 (0.10–0.36) < 0.001 0.40 (0.21–0.54) 0.50 (0.33–0.94) 0.002
AP (CaOx) index 0.46 (0.29–0.65) 0.67 (0.34–1.13) < 0.001 1.12 (0.74–1.80) 1.28 (0.87–2.55) 0.052
AP (CaP) index 8.24 (2.34–21.86) 1.09 (0.16–3.04) < 0.001 8.85 (1.78–62.5) 3.03 (0.34–5.56) 0.014
  1. Results are expressed as median (P25-P75)