Table 1.
Basal characteristics of 75 truly idiopathic calcium oxalate stone formers
| Parameter | |
|---|---|
| Gender | 66 men/9 women |
| Age (years) | 51.5 ± 1.5 |
| Weight (kg) | 83.6 ± 1.8 |
| BMI (kg/m2) | 27.2 ± 0.5 |
| Number of stone episodes | 6.5 ± 0.8 |
| Main comorbidities | |
| Arterial hypertension | 19/75 (25.3%) |
| Dyslipidemia | 12/75 (16.0%) |
| Vitamin D deficiency | 11/75 (14.7%) |
| Hyperuricemia | 9/75 (12.0%) |
| Low-calcium diet (self-selected or recommended) | 46/75 (61.3%) |
| Daily calcium intake (mg) on low-calcium diet (n = 46 ) | 371 ± 29 |
| Daily calcium intake (mg) without restriction (n = 29) | 994 ± 104* |
| Salt intake (g/day) | 10.1 ± 0.4 |
| Total protein intake (g/day) | 83 ± 2 |
Calcium intake reflects calcium consumption from dairy products and mineral waters, as indicated by the patients and calculated from publicly available data in Switzerland. Salt and total protein intake was derived from 24-h urine excretions of sodium and urea, respectively. For details, see text
*p < 0.001 vs. habitual low calcium intake