![]() ![]() ![]() However, an inverted U-shaped relationship was found when we performed the smooth curve fitting method, and the inflection point was calculated at 9.6 mg/dL using the two-piecewise linear regression model. The fully-adjusted model showed serum calcium positively correlated with total BMD. ResultsĪ total of 5990 individuals aged between 12 and 19 years were included in this study. 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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