MAOB and post-traumatic stress disorder: To confirm this finding, we evaluated platelet MAO-B activity in all of the individual items listed in the PANSS-positive and PANSS-psychotic subscales, and found reduced platelet MAO-B activity in smokers and non-smokers with PTSD with severe delusions, conceptual disorganization, hallucinatory behavior, and excitement symptoms compared with corresponding groups with mild symptoms.