To confirm the results obtained by comparing platelet MAO-B activity between war veterans with PTSD with mild and severe symptoms evaluated by PANSS subscales, platelet MAO-B activity was additionally evaluated in veterans with severe symptoms compared with those with mild symptoms according to the individual items of each PANSS subscale in smokers (Table 3) and non-smokers (Table 4). The gene discussed is MAOB; the disease is post-traumatic stress disorder.