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Aims   To explore the relationships of procollagen type 1 N-terminal propeptide (P1NP) and  β  cross-linked C-telopeptide of type 1 collagen ( β -CTX) with bone mineral density (BMD) in postmenopausal women.Methods   All postmenopausal women were selected from a community-based case-control study. The anteroposterior L1-L4 and left proximal femur BMD were measured. P1NP and  β -CTX were also collected and tested. The main correlation analysis was applied to explore the relationships of BMD, P1NP, and  β -CTX.Results   The total 1055 postmenopausal women were enrolled. The BMD at all sites kept a decrease continually with age ( P  < 0.01). In addition, the level of  β -CTX increased significantly from 45 to 50 years old and remained at a high level in the later stage, while the level of P1NP changed little or even decreased with age. Logistic regression model showed that  β -CTX has better ability to predict BMD than P1NP, as demonstrated by an area under the curve (AUC) of 0.63.Conclusion   P1NP and  β -CTX are important markers to monitor bone metabolism. This trial is registered with  ChiCTR-SOC-17013090 . The date of registration is Oct. 23, 2017.

Exploring the Relationship of Bone Turnover Markers and Bone Mineral Density in Community-Dwelling Postmenopausal Women