Table 3 Analysis of the threshold effect of high-density lipoprotein cholesterol on serum 25(OH)D based on a two-piece Linear Regression Mode
25(OH)D | Adjusted β (95% CI) P value |
|---|---|
Fitting by the standard linear model | 8.15 (6.87, 9.44) < 0.0001 |
Fitting by the two-piecewise linear model | |
Inflection point | 2.07 |
Direct HDL cholesterol < 2.07(mmol/L) | 10.07 (8.49, 11.65) < 0.0001 |
Direct HDL cholesterol > 2.07(mmol/L) | -0.80 (-5.32, 3.72) 0.7294 |
Log likelihood ratio | < 0.001 |