Table 2.
Associations of 24-hour urine parameters with calcium oxalate and calcium phosphate supersaturation by race
| Calcium Oxalate Supersaturation | Calcium Phosphate Supersaturation | |||||
|---|---|---|---|---|---|---|
| Calcium, 10 mg/d | Oxalate,a,b 10 mg/d | Volume, L/d | Calcium,a 10 mg/d | pH, U/d | Volume,a L/d | |
| Black | 0.35 (0.31 to 0.39) | 1.35 (1.27 to 1.43) | −4.34 (−4.40 to −4.28) | 0.06 (0.05 to 0.07) | 0.60 (0.58 to 0.62) | −0.61 (−0.65 to −0.57) |
| White | 0.17 (0.14 to 0.21) | 0.31 (0.29 to 0.34) | −3.15 (−3.29 to −3.01) | 0.03 (0.02 to 0.04) | 1.30 (1.22 to 1.38) | −0.45 (−0.51 to −0.39) |
| Difference in slope estimate between whites and blacks | −0.18 (−0.23 to 0.13) | −1.04 (−1.09 to 0.99) | 1.19 (1.09 to 1.29) | −0.03 (−0.04 to −0.02) | 0.70 (0.64 to 0.76) | 0.16 (0.13 to 0.19) |
| P value for difference in slope between whites and blacks | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 |
Values represent slope estimates for each clinical variable by racial group as seen in Figures 1 and 2, as well as an estimate of differences between groups. Where significant, any two- and three-way interactions are noted.
a
Interaction between sex and race present: P value for interaction <0.001.
b
Three-way interaction between sex, oxalate, and race present: P value for interaction <0.001.