The probability value for each of the antiepileptic drugs (AEDs) studied being significantly associated with greater than 10% VFD using the Kruskal-Wallis one way analysis of variance when comparing the three groups: patients currently on the AED, patients previously on the AED and patients never on the AED
| AED | Kruskal-Wallis |
Asymmetrical significance |
| VGB | 14.327 | 0.001 |
| CBZ | 0.820 | 0.664 |
| PHT | 0.114 | 0.945 |
| CLB | 2.807 | 0.246 |
| GBP | 0.865 | 0.649 |
| TPR | 1.056 | 0.303 |
| PHB | 1.918 | 0.383 |
| VPA | 3.580 | 0.167 |
| DZM | 1.307 | 0.253 |
| LTG | 0.632 | 0.729 |
VGB = vigabatrine, CBZ = carbamazepine, PHT = phenytoin, CLB = clobazam, GBP = gabapentin, TPR = topiramate, PHB = phenobarbitone, VPA = valproate, DZM = diazepam, LMG = lamotrigine.