[Incidence of different types of hypercalciuria in the Madrid area. Demographic features]

A study to determine the incidence of idiopathic hypercalciuria was performed in 110 patients (59 females, 51 males). Classification of this metabolic disorder according to its different types revealed the following incidence: 50% for absorptive hypercalciuria, 14.5% for hypercalciuria from loss of renal phosphates, and 30% for renal hypercalciuria. Insufficient biochemical data with a significant value did not permit classification of 6.3%. Analysis of distribution according to sex revealed a similar incidence (50%) for males and females for absorptive hypercalciuria, a prevalence in men (71%) for hypercalciuria due to loss of renal phosphates, and a prevalence in females (64.7%) for renal hypercalciuria. However, correction of these data according to the male to female ratio of our study population revealed renal hypercalciuria to be more prevalent in females whereas absorptive hypercalciuria and hypercalciuria from loss of renal phosphates were more prevalent in men. Analysis of distribution according to age revealed a direct relationship between the increased incidence of renal hypercalciuria and patient age.