TABLE 1.
Subject characteristics
| Characteristics | Cases (n = 87) | Controls (n = 343) |
|---|---|---|
| Reference age,a mean (SD), range | 61.4 (9.1), 45–87 | 61.5 (7.6), 45–80 |
| FAME enrollment age, mean (SD), range | 68.7 (8.4), 48–89 | 69.1 (8.2), 42–88 |
| Years from reference date until exam, mean (SD), range | 7.6 (5.2), 0–22 | 7.8 (4.5), 0–22 |
| State, n from Iowa (%) | 67 (77) | 247 (72) |
| Male, n (%) | 63 (72) | 261 (76) |
| Non-white or Hispanic, n (%) | 2 (2.3) | 8 (2.3) |
| n (%) missing race/ethnicity data | 0 | 6 (1.7) |
| Proxy respondent, n (%) | 15 (17) | 3 (1) |
| PD in first-degree relative, n (%) | 12 (14) | 22 (7) |
| Education, mean years (SD) | 12.6 (2.1) | 12.6 (2.1) |
| Cigarette smoker, n (%) | 19 (22) | 123 (36) |
| Head injury, n (%) | 20 (24) | 60 (18) |
| GSTT1*0, n (%) | 24 (28) | 71 (21) |
| GSTM1*0, n (%) | 41 (47) | 182 (53) |
| GSTT1*0 and GSTM1*0, n (%) | 9 (10) | 26 (8) |
| Paraquat use, n (%) | 21 (24) | 52 (15) |
a
Age at diagnosis for cases; median case diagnosis age in the corresponding gender-, state-, and age-specific stratum for controls.
Abbreviation: SD, standard deviation.