TABLE 3. Confusion Matrix.
| Predicted Class | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| cAHI < 5 | 5
 cAHI < 10 |
10
 cAHI < 15 |
cAHI
 15 |
||||||
| PPG – EXPERT | LOCAL–EXPERT | PPG – EXPERT | LOCAL–EXPERT | PPG – EXPERT | LOCAL–EXPERT | PPG – EXPERT | LOCAL–EXPERT | ||
| True Class | cAHI < 5 | 203 | 203 | 9 | 8 | 1 | 1 | 0 | 1 |
5
 cAHI < 10 |
5 | 5 | 5 | 6 | 0 | 0 | 1 | 0 | |
10
 cAHI < 15 |
2 | 3 | 1 | 3 | 3 | 1 | 4 | 3 | |
cAHI
 15 |
0 | 1 | 1 | 2 | 2 | 0 | 8 | 8 | |
PPG–EXPERT refers to the PPG-based method’s predictions compared to Expert Analysis. LOCAL–EXPERT refers to the Local Analysis compared to the Expert Analysis. cAHI = central apnea-hypopnea index, PPG = photoplethysmography