Influence of body mass index on pediatric urolithiasis

The results of our study indicate that BMI itself could not be considered as a separate and definite risk factor for urolithiasis development in children. Although the mechanisms and causative factors for urinary stone formation are better defined in adults, further studies investigating these parameters in children are warranted.Table. Patients' characteristics and 24-h urine parameters for BMI groups.L-BMI mean ± SDN-BMI mean ± SDU-BMI mean ± SDpSex Male28860.575 Female24126Age (years)6.9 ± 4.09.2 ± 4.59.4 ± 5.50.071BMI (kg/m2)15.5 ± 1.620.8 ± 1.530.1 ± 2.9<0.001Stone number1.6 ± 1.02.0 ± 1.51.7 ± 0.80.709Stone size (mm)13.7 ± 10.213.8 ± 10.513.0 ± 9.60.951Ca (mg/kg/24 h)3.7 ± 3.04.2 ± 3.91.3 ± 0.90.021Citrate (mg/1.73 m2/24 h)362 ± 442461 ± 391622 ± 4500.057Uric acid (mg/kg/24 h)4.6 ± 4.03.2 ± 2.71.8 ± 1.40.017aOxalate (mg/1.73 m2/24 h)7.4 ± 10.612.0 ± 12.49.9 ± 6.20.003Magnesium (mg/kg/24 h)4.0 ± 3.33.3 ± 2.13.2 ± 2.20.609Sodium (mmol/24 h)91.3 ± 46.9108.2 ± 76.188.3 ± 45.90.897aDifference between L-BMI and U-BMI groups.