SLC6A3 and major depressive disorder: They found that individuals with the SLC6A3 3′UTR VNTR’s SS (9R/9R) genotype had a higher Beck Depression Inventory (BDI) depression scale (p = 0.022) and Hamilton Depression Rating Scale (HDRS or Ham-D) (p = 0.00001) score, in addition to a higher BMI (p = 0.001).