| Variable | PBO/EDX (N = 207) | EDX/EDX (N = 190) |
| Age, mean years (SD) | 45.8 (11.53) | 44.0 (11.39) |
| <55 years, n (%) | 156 (75.4) | 158 (83.2) |
| ≥55 years, n (%) | 51 (24.6) | 32 (16.8) |
| Female, n (%) | 120 (58.0) | 120 (63.2) |
| Race, n (%) | ||
| White | 162 (78.3) | 146 (76.8) |
| Black | 33 (15.9) | 34 (17.9) |
| American Indian or Alaska Native | 3 (1.4) | 0 (0.0) |
| Asian | 2 (1.0) | 2 (1.1) |
| Multi-racial | 5 (2.4) | 7 (3.7) |
| Native Hawaiian or Other Pacific Islander | 1 (0.5) | 0 (0.0) |
| Other | 1 (0.5) | 1 (0.5) |