Yu et al. [33] also assessed the association between the MAOA uVNTR polymorphism and MDD (DSM-IV major depression; HAM-D-1967 ≥ 18) and found that the 4R allele was more common in MDD women (X2 = 6.93; df = 1; p = 0.009) and MDD men (X2 = 6.27; df = 1; p = 0.015) compared to the control group (mostly composed of medical staff) [33]. The gene discussed is MAOA; the disease is major depressive disorder.