has symptom has major susceptibility factor specific developmental disorder attention deficit hyperactivity disorder EFO:0003888 MIM:612311 MIM:612312 SNOMEDCT_US_2025_09_01:229713001 UMLS_CUI:C0041671 disease_ontology MIM:608906 MIM:608905 MESH:D001289 ADHD MIM:608904 DOID:1094 MIM:608903 DOID:1093 A specific developmental disorder that is characterized by co-existence of attentional problems and hyperactivity, with each behavior occurring infrequently alone and symptoms starting before seven years of age. MIM:143465 Xref MGI. attention deficit disorder hyperkinetic disorder susceptibility to attention deficit-hyperactivity disorder 7 hyperactivity