Table 4.
Selected feature values.
| Selected features | Waveform | Normalized time** | Normalized frequency** |
|---|---|---|---|
| 1* 1/ PTT | - | - | - |
| 2. The square root of body weight | - | - | - |
| 3. Wavelet coefficients | Pulse wave | 11 | 7 |
| 4. Wavelet coefficients | ECG | 14 | 3 |
| 5. Bodyweight | - | - | - |
| 6. Wavelet coefficients | Pulse wave | 19 | 1 |
| 7. Heart rate | - | - | - |
| 8. Wavelet coefficients | Pulse wave | 1 | 2 |
| 9. Wavelet coefficients | ECG | 1 | 2 |
| 10. Wavelet coefficients | Pulse wave | 17 | 1 |
| 11. Pulse transit time | - | - | - |
| 12. Wavelet coefficients | ECG | 19 | 2 |
| 13. Wavelet coefficients | Pulse wave | 13 | 1 |
| 14. Wavelet coefficients | Pulse wave | 14 | 1 |
| 15. Wavelet coefficients | Pulse wave | 20 | 1 |
| 16. Wavelet coefficients | Pulse wave | 5 | 1 |
| 17. Wavelet coefficients | ECG | 5 | 1 |
| 18. Wavelet coefficients | ECG | 8 | 1 |
| 19. Wavelet coefficients | ECG | 19 | 1 |
| 20. Peak of ECG | ECG | - | - |
| 21. Wavelet coefficients | ECG | 20 | 4 |
| 22. Wavelet coefficients | Pulse wave | 10 | 1 |
| 23. Wavelet coefficients | Pulse wave | 8 | 1 |
| 24. Wavelet coefficients | Pulse wave | 8 | 2 |
PTT, pulse transit time, ECG, electrocardiogram.
*
Numbers are assigned in order of the effectiveness of features.
**
Wavelet coefficients of ECG/pulse wave: The time indicates the number from the beginning of the normalized time axis divided into 20 equal parts. The frequency indicates the number from the beginning of the normalized frequency axis divided into 8 equal parts.