![]() Smooth curve fitting was used to explore the potential non-linear relationship. Weighted multivariate linear regression models were used to estimate the associations of serum calcium, 25(OH)D level with total BMD. We aimed at exploring the associations between serum calcium, vitamin D level, and bone mineral density (BMD) in adolescents included in the National Health and Nutrition Examination Survey (NHANES) 2001–2006. It is important to improve our understanding of the roles of calcium and vitamin D in bone health for preventing osteoporosis.
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