BDNF and Alzheimer disease: The PSM was set to reduce potential differences connected with these sociodemographic variables when the distribution of FKBP5 rs1360780, BDNF rs6265, and NRN1 rs1475157 allele and genotypes between AD patients and controls with low, medium, and high GSES levels as an outcome variable was analyzed (Supplementary Material Table 2A).