Table 5.
Twenty-four-hour urine components by sex
| Mean (SD) | ||||||
|---|---|---|---|---|---|---|
| Men (n = 1145) | Women (n = 5189) | Adjusted Difference (95% CI) | P-value | Adjusted Difference (95% CI)a | P-valuea | |
| Creatinine (g) | 1.65 (0.37) | 1.18 (0.25) | 0.56 (0.54, 0.58) | <0.001 | 0.47 (0.45, 0.48) | <0.001 |
| Potassium (mEq) | 76.4 (25.1) | 61.2 (21.1) | 16.1 (14.6, 17.6) | <0.001 | 14.5 (12.9, 16.0) | <0.001 |
| Calcium (mg) | 197 (106) | 201 (98) | 4.4 (−2.4, 11.2) | 0.21 | −1.8 (−8.8, 5.2) | 0.62 |
| Oxalate (mg) | 40.3 (13.0) | 29.7 (10.9) | 11.3 (10.5, 12.0) | <0.001 | 9.4 (8.6, 10.2) | <0.001 |
| Citrate (mg) | 696 (308) | 741 (306) | 29.1 (8.5, 49.8) | 0.006 | 2.5 (−18.8, 23.8) | 0.82 |
| Uric acid (mg) | 618 (229) | 517 (157) | 153 (142, 165) | <0.001 | 118 (106, 129) | <0.001 |
| Sodium (mEq) | 183 (70) | 142 (59) | 45.7 (41.5, 49.9) | <0.001 | 30.4 (26.3, 34.6) | <0.001 |
| Magnesium (mg) | 124 (44) | 104 (39) | 23.2 (20.5, 26.0) | <0.001 | 20.4 (17.5, 23.2) | <0.001 |
| Phosphate (mg) | 1067 (323) | 816 (262) | 301 (282, 319) | <0.001 | 237 (218, 255) | <0.001 |
| pH (U) | 5.86 (0.46) | 6.10 (0.51) | −0.19 (−0.23, −0.16) | <0.001 | −0.12 (−0.16, −0.09) | <0.001 |
| Volume (mL) | 1690 (650) | 1930 (810) | −143 (−196, −91) | <0.001 | −180 (−235, −126) | <0.001 |
| SS CaOx | 8.57 (5.08) | 6.26 (4.00) | 2.12 (1.85, 2.40) | <0.001 | 2.00 (1.71, 2.29) | <0.001 |
| SS CaP | 1.90 (1.63) | 1.57 (1.43) | 0.26 (0.17, 0.36) | <0.001 | 0.34 (0.24, 0.44) | <0.001 |
| SS UA | 2.09 (1.59) | 1.05 (1.16) | 0.94 (0.86, 1.03) | <0.001 | 0.76 (0.68, 0.85) | <0.001 |
Differences are reported with women as referent category and adjusted for age and kidney stone status. aFurther adjustment for body weight. CaOx, calcium oxalate; CaP, calcium phosphate; SD, standard deviation; SS, supersaturation; UA, uric acid.