Table 5 Comparison of various methods in Cox regression for the variable selection.
Variables | Coefficient based on univariate Cox regression results | Coefficient based on multivariate Cox regression results | ||||
|---|---|---|---|---|---|---|
Forced entry | Backward elimination | Bidirectional stepwise selection | Forced entry | Backward elimination | Bidirectional stepwise selection | |
RDW | 0.170 | 0.172 | 0.182 | 0.172 | 0.172 | 0.172 |
RR | 0.049 | 0.052 | 0.055 | 0.052 | 0.052 | 0.052 |
SAPS II | 0.021 | 0.029 | 0.020 | 0.029 | 0.029 | 0.029 |
Age | 0.011 | NA | 0.011 | NA | NA | NA |
BUN | 0.005 | NA | NA | NA | NA | NA |
Creatinine | − 0.048 | NA | NA | NA | NA | NA |
Glucose | 0.002 | NA | 0.002 | NA | NA | NA |
SpO₂ | − 0.019 | NA | NA | NA | NA | NA |
AIC | 1353.706 | 1351.564 | 1349.946 | 1351.564 | 1351.564 | 1351.564 |
