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Table 4 Threshold effect analysis of serum LDL-C/Apo B ratio on lumbar BMD

From: The correlation between the serum LDL-C/Apo B ratio and lumbar bone mineral density in young adults

Lumbar bone mineral density

Adjusted β (95% CI)

Male

 20-30 years

  Fitting by standard linear model

-0.0570 (-0.1656, 0.0517)

  Fitting by two-piecewise linear model

 

  Inflection point

1.08

  serum LDL-C/Apo B ratio < 1.08

0.0096 (-0.2967, 0.3159)

  serum LDL-C/Apo B ratio > 1.08

-0.0697 (-0.1915, 0.0520)

  Log-likelihood ratio

0.638

 Mexican American

  Fitting by standard linear model

0.0462 (-0.1350, 0.2274)

  Fitting by two-piecewise linear model

 

  Inflection point

1.39

  serum LDL-C/Apo B ratio < 1.39

0.2113 (-0.0101, 0.4327)

  serum LDL-C/Apo B ratio > 1.39

-0.4082 (-0.8121, -0.0044)

  Log-likelihood ratio

0.007

Female

 Non-Hispanic black

  Fitting by standard linear model

0.0346 (-0.1323, 0.2015)

  Fitting by two-piecewise linear model

 

  Inflection point

1.20

  serum LDL-C/Apo B ratio < 1.20

0.4646 (0.0779, 0.8514)

  serum LDL-C/Apo B ratio > 1.20

-0.1111 (-0.3140, 0.0917)

  Log-likelihood ratio

0.009

 Mexican American

  Fitting by standard linear model

0.0122 (-0.1933, 0.2177)

  Fitting by two-piecewise linear model

 

  Inflection point

1.44

  serum LDL-C/Apo B ratio < 1.44

-0.1290 (-0.3472, 0.0892)

  serum LDL-C/Apo B ratio > 1.44

1.7282 (0.6076, 2.8488)

  Log-likelihood ratio

 < 0.001

  1. Age, race/ethnicity, education, income to poverty ratio, waist circumference, smoking behavior, alcohol consumption, physical activity, calcium supplementation, serum total alkaline phosphatase, serum uric acid, total protein, total cholesterol, triglycerides, HDL cholesterol, serum phosphorus, serum calcium, fasting blood glucose, systolic blood pressure and diastolic blood pressure were adjusted. In the subgroup analysis stratified by age and race/ethnicity, the model was not adjusted for age or race/ethnicity