TNFRSF11B and diabetes mellitus: Although the association between serum OPG level and ARV of SBP was not significantly modified in any subgroups (Table 4), the association of serum OPG level with SD (Table 5) and CoV of SBP (Table S4) was significantly modified by Charlson comorbidity index and history of DM, suggesting that the association of serum OPG with BPV is more prominent in the subjects with Charlson comorbidity index ≤3 and in the subjects without history of DM.