SLC6A3 and obesity disorder: In the case of DAT1-VNTR, 9R9R homozygotes patients in DAT1-VNTR showed a tendency toward a higher risk of obesity BMI than 10R10R homozygotes patients (Figure 1b, X2: 4.24, df: 2, p = 0.120, OR: 2.82 [1.02–7.82]).