PTH and osteoporosis: However, from the analysis of other indexes that may be associated with VD in this study, it’s found that although most of participants (82.0%) were in VD insufficiency or deficiency, the distribution of their PTH and Ca was within normal reference range (normal PTH and Ca are 87.5% and 94.0%, respectively), and the proportion of participants with osteoporosis was not high (participants with osteoporosis in lumbar vertebrae accounting for 21.2% and participants with osteoporosis in femoral neck only accounting for 1.6%).