Number of seizures per year post-surgery for all patients predicted to have good outcome. Combining the results of the Naïve Bayes algorithm in Fig. 6, there were 13 patients predicted to have good outcome. Nine of them were Class 1 and did not have any seizures after surgery for 6–8 years (black) (n = 9). The other four were Class 2, three of whom had seizure-free periods more than 4 years long (UMHS47, 19, 38).