nominally significantP =0.003
11 , 12 Other investigators have determined that the −521 C>T and 120 bp tandem repeat (TR) polymorphisms in DRD4 are associated with nominally significant summary odds ratios (ORs) as risk factors for schizophrenia ( P =0.003 and 0.005, respectively). 11 However, despite a great deal of research, an association between DRD4 polymorphisms and schizophrenia risk remains debatable.