Table 1.
The values of studied parameters in pediatric stone formers and healthy controls
| Characteristics | Stone formers | Healthy controls | p |
|---|---|---|---|
| N | 257 (♂ 131, ♀ 126) | 270 (♂ 138, ♀ 132) | |
| Age (years) | 13.59 (3.75–17.94) | 11.50 (4.31–17.83) | 0.1 |
| Weight (kg) | 44.00 (13.50–75.00) | 44.40 (16.90–89.00) | 0.12 |
| Height (cm) | 155.00 (93.00–180.00) | 150.00 (108.5–181.0) | 0.82 |
| BMI z-score | 0.13 (− 1.61–1.54) | 0.37 (− 1.52–2.31) | 0.18 |
| Creatinine (mg/kg/24 h) | 19.39 (19.10–31.52) | 17.90 (11.00–27.29) | 0.000 |
| Urine volume (ml/24 h) | 1225 (409–3000) | 911 (337–2200) | 0.000 |
| Urine volume (ml/kg/24 h) | 31.37 (15.11–68.96) | 23.17 (6.69–50.66) | 0.000 |
| Osmolar load (mOsm/24 h) | 548.00 (232.30–1135.20) | 484.82 (247.50–1057.92) | 0.000 |
| Initial 24-h urine osmolality (IUOsm) (mOsm/kg H2O) | 422.00 (227.00–853.00) | 579.00 (256.00–1069.00) | 0.000 |
| Upper metastable limit osmolality (UMLOsm) (mOsm/kg H2O) | 2044.64 (1007.03–2955.48) | 3677.11 (2289.22–5855.62) | 0.000 |
| Weight reduction index (WRInd) (g/g) | 4.42 (2.58–9.57) | 7.21 (2.74–15.31) | 0.000 |
Values are presented as median, with the range (5–95%) given in parenthesis