Table 2.

Mean 24-h urinary excretion in white and black womena

ParameterWhite(n = 330)Black(n = 146)P
Creatinine (mg)1036 (1017; 775 to 1326)1225 (1199; 953 to 1528)<0.001
Calcium (mg)183 (170; 73 to 302)118 (99; 32 to 240)<0.001
Oxalate (mg)28 (26; 18 to 40)30 (29; 20 to 41)0.06
Citrate (mg)686 (657; 332 to 1012)653 (598; 259 to 1056)0.28
Uric acid (mg)448 (435; 281 to 662)450 (417; 284 to 639)0.93
Sodium (mEq)137 (127; 72 to 204)142 (139; 79 to 207)0.30
Potassium (mEq)64 (61; 39 to 94)55 (54; 33 to 80)<0.001
Magnesium (mg)104 (98; 63 to 152)93 (89; 51 to 151)0.003
Phosphate (mg)743 (706; 465 to 1040)623 (592; 357 to 881)<0.001
Sulfate (mmol)17 (17; 10 to 26)14 (13; 8 to 22)<0.001
pH (U)6.08 (6.07; 5.42 to 6.71)6.19 (6.25; 5.40 to 6.91)0.03
Volume (L)2.03 (1.96; 1.14 to 2.96)1.79 (1.68; 0.91 to 2.80)0.001
RSS CaOx1.24 (1.07; 0.48 to 2.18)1.06 (0.82; 0.30 to 2.25)0.03
RSS brushite1.09 (0.79; 0.20 to 2.23)0.80 (0.53; 0.11 to 1.77)0.002
RSS uric acid1.12 (0.81; 0.18 to 2.65)1.03 (0.60; 0.13 to 3.00)0.41
  • a Data are means (median; 10th to 90th percentile range). Statistically significant P values are in boldface. RSS, relative supersaturation.