Results: Bone density was negatively correlated with age at the lumbar spine (LS) (r = - 0.225), total hip (total H) (r = - 0.288), femoral neck (FN) (r = - 0.352); with urea at the total H (r = - 0.206), FN (r = - 0.194); with PTH at LS (r = - 0.266), total H (r = - 0.219), FN (r = - 0.168); with β2 Microglobulin at the LS (r = - 0.269).