Spearman correlation analysis showed that baseline modified Rankin Scale (mRS) scores were correlated with serum antibody titers and CSF antibody titers.<h4>Conclusions</h4>Baseline mRS scores and low-frequency power in the frontotemporal region showed a positive correlation with anti-LGI1 antibody titers, suggesting that antibody levels may reflect disease severity in LGI1 autoimmune encephalitis. This evidence concerns the gene LGI1 and autoimmune encephalitis.