Table 4 Threshold effect analysis of total cholesterol on total bone mineral density in 40–49 years old group using the two-piecewise linear regression model
Total bone mineral density | Adjusted β (95% CI) P value |
|---|---|
Aged 40–49 years old | |
Fitting by the standard linear model | − 0.0006 (− 0.0045, 0.0033) 0.7696 |
Fitting by the two-piecewise linear model | |
Inflection point | 5.84 |
Serum cholesterol < 5.84 mmol/L | − 0.0063 (− 0.0117, − 0.0009) 0.0225 |
Serum cholesterol > 5.84 mmol/L | 0.0092 (0.0017, 0.0167) 0.0161 |
Log likelihood ratio | 0.003 |