Gene-level analysis identified three SNPs associated with ADHD (CERS6-rs183574665, P = 0.005; SMPDL3B-rs11577165, P = 0.022; CERK-rs9616098, P = 0.010), but significance was lost after LD correction (Supplementary Table S2). Here, CERS6 is linked to attention deficit-hyperactivity disorder.