As initial linear regression analysis revealed no statistically significant association between SVR and BMD in premenopausal women, a two-piecewise linear regression model was conducted and identified a critical threshold at 0.31 kg/cm2, demonstrating a significant positive association below this point (β = 360.48, 95% CI: 206.18-514.78) and a negative trend beyond it (β = -47.05, 95% CI: -116.66-22.55), with the log-likelihood ratio test confirming the model’s statistical significance (Table 3 ).
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Sex-specific associations between muscle-fat ratio and bone density in middle-aged adults.
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