| Healthy control group | Malignant ventricular arrhythmia group | t | P value | ||
Mean | standard deviation | Mean | standard deviation | |||
Tp-ec(mm) | 75.97 | 16.67 | 141.59 | 45.10 | −14.07 | <0.001 |
Q-Tc(mm) | 421.50 | 20.48 | 484.95 | 107.34 | −5.81 | <0.001 |
Tp-e/Q-T | 0.18 | 0.04 | 0.29 | 0.05 | −17.88 | <0.001 |
SDNN | 127.40 | 35.18 | 81.50 | 12.39 | 12.307 | <0.001 |