Additional analyses showed that lower serum iPTH correlated with lower PINP (r = 0.31, p = 0.001), CTX (r = 0.36, p < 0.001) and BAP (r = 0.26, p < 0.01) in patients with T2DM but not in non-diabetic controls (Table 4A and B). This evidence concerns the gene CYP27A1 and type 2 diabetes mellitus.