Table 1.
Characteristics of study population
| Characteristic | Cases (N = 357) n (%) | Controls (N = 807) n (%) |
|---|---|---|
| Sex (male) | 205 (57.4) | 371 (46.0) |
| Agea | ||
| Mean ± SD | 68.3 ± 10.2 | 66.2 ± 11.6 |
| Range | 34–88 | 35–99 |
| ≤60 years | 75 (21.0) | 254 (31.5) |
| >60 years | 282 (79.0) | 553 (68.5) |
| Cigarette smoking | ||
| Never | 187 (52.4) | 389 (48.2) |
| Former | 150 (42.0) | 328 (40.6) |
| Current | 20 (5.6) | 90 (11.2) |
| Race | ||
| White | 287 (80.4) | 564 (69.9) |
| Non-White | 70 (19.6) | 242 (30.0) |
| Unspecified | 1 (0.1) | |
| Education | ||
| 0–<12 years | 66 (18.5) | 116 (14.4) |
| 12 years | 96 (26.9) | 166 (20.6) |
| >12 years | 195 (54.6) | 525 (65.0) |
| First-degree relative with PDb | ||
| No | 305 (85.4) | 742 (91.9) |
| Yes | 52 (14.6) | 65 (8.1) |
aThis is the age at diagnosis for cases and age at interview for controls.
bWe assumed that 26 controls who did not report family history of PD did not have first-degree relatives with PD.