Table 6.
The confusion matrix of the knowledge-based algorithm for each fall and ADL. The number of falls and ADLs is the total number of five-fold cross-validations over five rounds.
| Predict Results and Measure Matrix | Fall (Ground Truth) | ADL (Ground Truth) | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Stand | stand up | Sit down | Walk | Stoop | Jump | Walk Backward | Stand from Sit | Stand from Squat | Sit (Normal) | Sit (Fast) | Lie (Normal) | Lie (Fast) | Go up Stairs | Go down Stairs | Walk (Normal) | Walk (Fast) | Jump (Ground) | Jump (Bed) | |
| Fall (Predicted) | 380 | 380 | 380 | 380 | 375 | 380 | 95 | 0 | 0 | 0 | 0 | 8 | 15 | 0 | 0 | 0 | 0 | 0 | 0 |
| ADL (Predicted) | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 150 | 150 | 150 | 150 | 137 | 135 | 185 | 145 | 150 | 150 | 145 | 150 |
| Sensitivity (%) | 100 | 100 | 100 | 100 | 98.68 | 100 | 100 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Specificity (%) | -- | -- | -- | -- | -- | -- | -- | 100 | 100 | 100 | 100 | 94.48 | 90 | 100 | 100 | 100 | 100 | 100 | 100 |
| False positive rate (%) | -- | -- | -- | -- | -- | -- | -- | 0 | 0 | 0 | 0 | 5.52 | 10 | 0 | 0 | 0 | 0 | 0 | 0 |
| False negative rate (%) | 0 | 0 | 0 | 0 | 1.32 | 0 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |