CHD2 and Lennox-Gastaut syndrome: The results showed that Lennox–Gastaut syndrome (LGS) was usually diagnosed in CHD2 non-CNVs patients, which presented the difference compared to the average value (2.94 people/epileptic encephalopathy) using the Pearson χ2 test, and the adjusted difference with the Bonferroni correction was disappearance (Supplementary Table S3).