What percentage of those diagnosed with schizophrenia didn't have brain abnormalities?
This ENIGMA study did not assess brain abnormalities at an individual level. Rather, it examined if the volumes of a range of subcortical brain structures differed between patients with schizophrenia and healthy control subjects at the group level, using a meta-analytic approach. The term "brain abnormalities" might be misleading in this context: The study was not about the type of brain abnormalities that would be detectable by a neuroradiological exam (for a study focusing on this, see Sommer et al, 2013, Schizophrenia Bulletin, doi: 10.1093.schbul.sbs037). It is therefore not possible to determine the percentage of patients who had brain abnormalities from the study.