Table 1.
Baseline clinical characteristics of the patients in the two study groups
| Clinical Characteristic | KSFs (n=57) | Non-KSFs (n=54) | P Value |
|---|---|---|---|
| Age, yr | 47±14 | 47±13 | 0.82 |
| Men | 32 (56) | 31 (57) | 0.89 |
| Comorbiditiesa | |||
| Systemic hypertension | 17 (35) | 5 (9) | 0.002 |
| Diabetes mellitus | 5 (10) | 1 (2) | 0.07 |
| Smokingb | 4 (12)b | 16 (30) | 0.06 |
| Laboratory results | |||
| Sodium, mEq/L | 141±2 | 143±2 | 0.02 |
| Potassium, mEq/L | 4.3±0.3 | 4.4±0.3 | 0.20 |
| Calcium, mg/dl | 9.4±0.4 | 9.6±0.4 | 0.26 |
| Phosphorus, mg/dl | 3.1±0.6 | 3.4±0.6 | 0.04 |
| Magnesium, mg/dl | 0.84±0.12 | ||
| Uric acid, mg/dl | 5.5±1.3 | ||
| Urea nitrogen, mg/dl | 16±5.9 | 14.8±2.8 | 0.58 |
| Creatinine, mg/dl | 1±0.4 | 0.9±0.1 | 0.45 |
| eGFR, ml/min–1 per 1.73 m–2 | 91±22 | 91±15 | 0.31 |
| Bicarbonate, mEq/L | 26±2 | 25±2 | 0.02 |
| Glucose, mg/dl | 88±18 | 93±18 | 0.08 |
| Albumin, g/L | 46±3 | 47±3 | 0.66 |
| Parathyroid hormone (range, 1.6–6.9 pmol/L) | 4.3 (3.1, 6.9) | ||
| 25(OH)vitamin D, nmol/L | 43 (28, 64) | ||
| 24-h urine collection (n=36) | |||
| Volume, liters | 2.0±0.9 | ||
| Sodium mEq/d | 156±46 | ||
| Potassium, mEq/d | 69±20 | ||
| Calcium, mg/d | 280 (124, 400) | ||
| Phosphorus, mg/d | 806±270 | ||
| Oxalate, mg/d | 30±7.2 | ||
| Uric acid, mg/d | 584±150 | ||
| Citrate, mg/d | 420 (360, 670) | ||
| Creatinine, mg/d | 1144±352 |
Data are presented as the mean ± SD, n (%), or median (25th percentile, 75th percentile). KSF, kidney stone former.
a
Comorbidity data were available in 50 KFSs.
b
Smoking history was available in 24 KFSs.