| No. | Features | Description |
| 1 | r_r | waveform duration between 2 consecutive r-peaks (ms) |
| 2 | QRS | QRS waveform duration (ms) |
| 3 | RQ | RQ waveform duration (ms) |
| 4 | RS | RS waveform duration (ms) |
| 5 | RP | RP waveform duration (ms) |
| 6 | RT | RT waveform duration (ms) |
| 7 | ST | ST waveform duration (ms) |
| 8 | PQ | PQ waveform duration (ms) |
| 9 | PT | PT waveform duration (ms) |
| 10 | RS-amp | RS segment amplitude (μv) |
| 11 | RQ-amp | RQ segment amplitude (μv) |
| 12 | TS-amp | ST segment amplitude (μv) |
| 13 | PQ-amp | PQ segment amplitude (μv) |