The urinary citrate/creatinine ratio was evaluated in 25 children with
idiopathic calcium urolithiasis and 24 controls. The mean (SD) urinar
y citrate/creatinine ratio in controls and patients was 0.510 (0.205)
and 0.181 (0.076), respectively, a statistically significant differenc
e. In neither group was there a relation between age and urinary citra
te excretion.