Comparison of Cox Predictive Models: Validation Dataset
| Step | Model 1 | ΔAIC model 1 | Model 2 | ΔAIC model 2 | P* |
| 1 | Amyloid PET | 25.9 | Nonimaging | 19.7 | 0.001 |
| 18F-FDG PET | 23.9 | Nonimaging | 19.7 | 0.004 | |
| Amyloid PET | 25.9 | 18F-FDG PET | 23.9 | 5 × 10−4 | |
| 2 | Nonimaging | 19.7 | Amyloid PET + nonimaging | 8.9 | 1 × 10−4 |
| Nonimaging | 19.7 | 18F-FDG PET + nonimaging | 8.5 | 8 × 10−5 | |
| Amyloid PET + nonimaging | 8.9 | 18F-FDG PET + nonimaging | 8.5 | 0.008 | |
| 18F-FDG PET | 23.9 | 18F-FDG PET + amyloid PET | 10.7 | 2 × 10−5 | |
| Amyloid PET | 25.9 | 18F-FDG PET + amyloid PET | 10.7 | 9 × 10−6 | |
| 3 | 18F-FDG PET + amyloid PET | 10.7 | Amyloid PET + 18F-FDG PET + nonimaging | 0 | 1 × 10−4 |
| Amyloid PET + nonimaging | 8.9 | Amyloid PET + 18F-FDG PET + nonimaging | 0 | 2 × 10−4 | |
| 18F-FDG PET + nonimaging | 8.5 | Amyloid PET + 18F-FDG PET+ nonimaging | 0 | 4 × 10−4 |
↵* Improvement in goodness of fit from models 1 to 2 (validation dataset).
ΔAIC is with reference to amyloid PET + 18F-FDG PET + nonimaging model that reached lowest AIC of all models (270.0).