PTH and Hypercalciuria: The unsupervised hierarchical cluster analysis by Euclidean wardd2 considering the three correlated variables serum calcium, phosphate, and PTH, identified two main clusters of patients with hypercalciuria (Figure 1): cluster 1 included 13 patients, cluster 2 included 61 patients, while three patients were excluded from the analysis due to unavailability of serum phosphate determinations.