Concerning peripheral inflammatory markers in ADHD, Howard et al. revealed higher levels of WBCs, neutrophils, and NLR in ADHD females compared to ADHD males [36], and Chang et al. found a significant effect of sex on IL-1β, IL-17, and IFN-γ, but without a further analysis of sex differences [80]. This evidence concerns the gene IFNG and attention deficit-hyperactivity disorder.