ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Polycyclic aromatic hydrocarbon, total total polycyclic aromatic hydrocarbon (PAH), also known as poly-aromatic hydrocarbons or polynuclear aromatic hydrocarbons Originally from the CUAHSI HIS VariableNameCV. See: http://his.cuahsi.org/mastercvreg/edit_cv11.aspx?tbl=VariableNameCV.