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The prevalence of the number of risk factors for PD
| Number of risk factors | Total group (% (n)) | Male (% (n)) | Female (% (n)) |
| 0 | 64.3 (498) | 69.2 (261) | 59.5 (237) |
| 1 | 24.5 (190) | 21.2 (80) | 27.6 (110) |
| 2 | 7.4 (57) | 5.8 (22) | 8.8 (35) |
| 3 | 3.2 (25) | 3.4 (13) | 3.0 (12) |
| 4 | 0.6 (5) | 0.3 (1) | 1.0 (4) |
