Table 2 Nonlinearity addressing of serum 25(OH)D level after natural log transformation and all-cause mortality
Outcome: | HR,95%CI, P value |
|---|---|
Fitting model by standard linear regression | 0.75 (0.65, 0.87) 0.0109 |
Fitting model by two-piecewise linear regression | |
Inflection point | 4.5 |
< 4.5 | 0.72 (0.61, 0.85) < 0.0001 |
> 4.5 | 1.16 (0.52, 2.61) 0.7114 |
P for the log-likelihood ratio test | 0.285 |