BDNF and post-traumatic stress disorder: In smokers with PTSD, nominally different PANSS cognition scores were found when veterans were subdivided into BDNF rs6265 genotypes (H = 6.647; df = 2; p = 0.036) and A carriers (U = 12,090.5; p = 0.029), however, allelic model (U = 35,181.5; p = 0.104) was not significant (Figure 2, Supplementary Table S3).