No statistically significant difference was found in respect to the mental health score and the score of each factor among different genotypes at rs1137070 of the MAOA gene (p > 0.05), and it could not be considered that the scores of mental health, somatization, obsessive-compulsive symptoms, interpersonal sensitivity, depression, anxiety, hostility, fear, paranoia, and psychosis were different among different genotypes of rs1137070 (Table 5). The gene discussed is MAOA; the disease is Paranoia.