Table 1
IFN-γ allele and carriership frequencies in patients with Parkinson's disease (PD) and in healthy controls as well as in patient subgroups whose ages of onset are early (<50 y) and late (⩾50 y)
| PD n (%) | Control n (%) | Early onset PD n (%) | Late onset PD n (%) | |
| Allele (bp): | ||||
| 116 | 1 (0.3) | 1 (1) | ||
| 118 | 2 (0.6) | 1 (0.3) | 2 (0.8) | |
| 120 | 52 (15.3) | 41 (13.1) | 23 (23) | 29 (12.1) |
| 122 | 157 (46.2) | 143 (45.5) | 35 (35) | 122 (50.8) |
| 124 | 19 (5.6) | 16 (5.1) | 8 (8) | 11 (4.6) |
| 126 | 93 (27.4) | 92 (29.3) | 28 (28) | 65 (27.1) |
| 128 | 9 (2.6) | 8 (2.5) | 1 (1) | 8 (3.3) |
| 130 | 1 (0.3) | 1 (0.3) | 1 (1) | |
| 132 | 6 (1.8) | 12 (3.8) | 3 (3) | 3 (1.3) |
| Total | 340 | 314 | 100 | 240 |
| Carriership: | ||||
| 122 carrier | 117 (68.8) | 109 (69.4) | 28 (56) | 89 (74.2) |
| 122 non-carrier | 53 (31.2) | 48 (30.6) | 22 (44) | 31 (25.8) |
| Total | 170 | 157 | 50 | 120 |
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For combined alleles 116, 118, 130, and 132, allele frequency: early onset PD v late onset PD χ2=14.3, df=5, Pc=0.028.
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Carriership frequency: early onset PD v late onset PD χ2=4.62, df=1, Pc=0.039.
