The overall PLI was significantly correlated with the history of epilepsy: PLI was lower when epilepsy duration was longer (Kendall's Tau = −0.389; p = 0.005) (see Figure 4). Correlations with PLI are shown in table 3. We found a significant correlation between the PLI and BSR, indicating that a higher level of sedation was correlated with increased PLI. Also, higher PLI was correlated with a higher age of onset. No correlation was found between seizure frequency and PLI. The significance level was set at p<0.013 for correlations of patient characteristics (epilepsy duration, age of onset, BSR, seizure frequency) with PLI, because four correlations were calculated. The correlations between epilepsy duration and BSR with PLI, remained significant after the Bonferroni correction.
