The genotypic distributions of three genotypes in the COMT gene were as follows: healthy controls, val/val, n = 68 (45.6%), val/met, n = 62 (41.6%), and met/met, n = 19 (12.8%); and patients with schizophrenia, val/val, n = 68 (47.5%), val/met, n = 62 (39.8%), and met/met, n = 19 (12.7%). The gene discussed is COMT; the disease is schizophrenia.