The increased AGA IgG (≥ 12 U/mL) antibody titer was related to a four-fold higher ODDS of schizophrenia development odds ratio (OR) = 4.00 (95% confidence interval (CI)): 1.43–11.19)) in the FS group and almost a seven-fold higher ODDS (OR = 6.68 (95% CI: 1.71–25.04)) in the CS group. The gene discussed is AGA; the disease is schizophrenia.