Table 2 An outline of the variables included in each model and the performance of each one as measured by AUC and AIC. CI; confidence interval, OR; odds ratio, AIC; Akaike Information Criterion, AUC; Area under the receiver operator curve
Model | Variable Selection | Variable | Coefficient | Wald | OR | 95% CI for OR | p-value | -2 log likelihood | AIC | AUC (95% CI) | Validation AUC | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lower | Upper | |||||||||||
Model 1 | Wald backward elimination | Brainstem infiltration | -2.313 | 22.252 | 0.099 | 0.038 | 0.259 | 0.000 | 128.574 | 122.574 | 0.869 (0.804–0.934) | 0.7824 |
Calcification | 1.217 | 3.297 | 3.375 | 0.908 | 12.549 | 0.069 | ||||||
Post-operative brainstem contusion | -3.505 | 32.567 | 0.030 | 0.009 | 0.100 | 0.000 | ||||||
Model 2 | Likelihood ratio backward elimination | Brainstem infiltration | -1.788 | 11.104 | 0.167 | 0.058 | 0.479 | 0.001 | 120.498 | 112.498 | 0.892 (0.838–0.946) | 0.7674 |
Brainstem compression | − 0.911 | 2.784 | 0.402 | 0.138 | 1.173 | 0.095 | ||||||
Calcification | 1.255 | 3.475 | 3.507 | 0.937 | 13.121 | 0.062 | ||||||
Post-operative brainstem contusion | -3.334 | 29.310 | 0.036 | 0.011 | 0.119 | 0.000 | ||||||
Model 3 | Wald and likelihood ratio forward selection | Brainstem infiltration | -2.144 | 20.188 | 0.117 | 0.046 | 0.299 | 0.000 | 132.247 | 128.247 | 0.862 (0.794–0.930) | 0.7922 |
Post-operative brainstem contusion | -3.067 | 33.114 | 0.047 | 0.016 | 0.132 | 0.000 | ||||||