DRD2 genotype distribution in Parkinson's disease cases and controls and distribution of MAO-B intron 13 and DRD2 genotype combinations in Parkinson's disease cases and controls
| Genotype | Cases | % | Controls | % | Total | % | OR | (95% CI) |
| TAQ I A: | ||||||||
| A22 | 84 | 67.2 | 135 | 66.8 | 219 | 67.0 | 1.00 | |
| A12 | 37 | 29.6 | 59 | 29.2 | 96 | 29.3 | 1.01 | (0.62–1.65) |
| A11 | 4 | 3.2 | 8 | 4.0 | 12 | 3.7 | 0.80 | (0.23–2.75) |
| TAQ I B: | ||||||||
| B22 | 109 | 71.7 | 172 | 74.5 | 281 | 73.4 | 1.00 | |
| B12 | 42 | 27.6 | 55 | 23.8 | 97 | 25.3 | 1.21 | (0.76–1.92) |
| B11 | 1 | 0.7 | 4 | 1.7 | 5 | 1.3 | 0.39 | (0.04–3.58) |
| Genotype combination | ||||||||
| MAO-B/DRD2 TAQIA: | ||||||||
| A+AA/A11+A12 | 16 | 13 | 44 | 22 | 60 | 18 | 1.00 | |
| G+GG+GA/A11+A12 | 25 | 20 | 23 | 11 | 48 | 15 | 2.99 | (1.33–6.68) |
| A+AA/A22 | 36 | 29 | 63 | 31 | 99 | 30 | 1.57 | (0.78–3.17) |
| G+GG+GA/A22 | 48 | 38 | 72 | 36 | 120 | 37 | 1.83 | (0.93–3.61) |
| MAO-B/DRD2 TAQIB: | ||||||||
| A+AA/B11+B12 | 16 | 11 | 38 | 16 | 54 | 14 | 1.00 | |
| G+GG+GA/B11+B12 | 27 | 18 | 21 | 9 | 48 | 13 | 3.05 | (1.35–6.91) |
| A+AA/B22 | 52 | 34 | 87 | 38 | 139 | 36 | 1.42 | (0.72–2.79) |
| G+GG+GA/B22 | 57 | 37 | 85 | 37 | 142 | 37 | 1.59 | (0.81–3.12) |