PTH and diabetes mellitus: Additionally, in patients with DM, PTH levels were significantly associated with the severity of WMH, PWMH and DWMH (p < 0.05), and the associations between PTH and both WMH and PWMH severity differed significantly between diabetic and non-diabetic subgroups (the interaction p-values were 0.016 and 0.02, respectively) (Figure 2).