TNFRSF11B and osteoporosis: Together with these studies, we found that OPG was independently and negatively associated with lumbar BMD in MHD patients after adjusting the covariates with optimal cutoff values of 388.38 pg/mL and 394.73 pg/mL associated with T scores < −1 (osteopenia and osteoporosis) or −2.5 (osteoporosis), respectively.