TF and major depressive disorder: The pooled ORs for per SD unit increase of transferrin on psychogenic disorder, depression, and gender identity disorders were 1.30 (95%CI: 1.13, 1.48); P < 0.001, 1.29 (95%CI: 1.03, 1.62; P = 0.03), and 0.73 (95%CI: 0.68, 0.78; P < 0.001), respectively.