Table 4.
Characteristics of participants who completed a 24-hour collection (n=2294)
| Characteristics | No Low Bone Density (n=1836) | Low Bone Density (n=458) |
|---|---|---|
| Age, yr | 53.6 (3.2) | 55.3 (2.8) |
| Race, white | 1792 (98) | 449 (98) |
| BMI, kg/m2 | 25.8 (4.9) | 23.6 (3.9) |
| Postmenopausal | 1121 (61) | 379 (82) |
| History of hypertension | 49 (3) | 11 (2) |
| History of diabetes | 26 (1) | 9 (2) |
| History of kidney stones | 46 (46 (2.5) | 16 (3.5) |
| Family history of kidney stones | 296 (16) | 88 (19) |
| Thiazide use | 37 (2) | 12 (3) |
| Dietary intake | ||
| Fluid intake, L/d | 1.7 (0.7) | 1.6 (0.7) |
| Vitamin D intake, IU | 1006 (786) | 1340 (794) |
| Calcium intake, mg/d | 959 (409) | 954 (414) |
| Median calcium supplement (25%–75%), mg/d | 500 (0–1000) | 800 (500–1024) |
| Urinary factors | ||
| Volume, L/d | 2.1 (0.9) | 2.1 (0.8) |
| Calcium, mg/d | 200 (92) | 214 (98) |
| Sodium, mEq/d | 139 (54) | 125 (52) |
| Oxalate, mg/d | 31 (11) | 31 (12) |
| Magnesium, mg/d | 107 (37) | 111 (43) |
| Citrate, mg/d | 804 (283) | 789 (262) |
| Potassium, mEq/d | 65 (20) | 65 (21) |
| Sulfate, mEq/d | 38 (11) | 35 (11) |
| Phosphorus, mg/d | 846 (244) | 766 (234) |
| Ammonium, mmol/d | 30 (10) | 27 (9) |
| Creatinine, mg/d | 1254 (206) | 1151 (190) |
Categoric variables are presented as N (%) unless otherwise indicated. Continuous variables are presented as mean (SD) unless otherwise indicated. BMI, body mass index.