TNFRSF11B and diabetes mellitus: Furthermore, separately examining T1DM patients and a priori adjusting for age, gender, years of diabetes, and HbA1c, serum levels of OPG were, again, only significantly (and inversely) associated with BMI (β −0.356, P-value 0.008), while BMI was also the only variable displaying a significant (positive) effect on cIMT measurements (β 0.604, P-value 0.013); serum levels of OPG were a priori included in the cIMT model (Table 4).