| Group 1 | Group 2 | P-Value | |
|---|---|---|---|
| Sex | Males were 14 (56%), female 11 (44%) | Males were 9(47.3%), Female were 10 (52.6%) | 0.57 |
| Mean age of patients, SD | 25.8 years (SD 11.8) | 24.8 years (SD 8.8) | 0.39 |
| Mean age at seizure onset, SD | 5.3 years (SD 5.6) | 4.1 years (SD 2.7) | 0.19 |
| Mean age at VNS implantation (years), SD | 18.8 (SD 11.9) | 18.3 (SD 7.5) | 0.43 |
| Mean epilepsy duration (years), SD | 20.5 (SD 10) | 19.3 (SD 8.2) | 0.33 |
| Mean AED before VNS | 3.2 | 3 | 0.22 |
| Mean AEDs after VNS | 3.2 | 3.2 | 0.48 |