Table 1.
Characteristics of study participants in the Professional Fighters Brain Health Study that comprise the dataset used to develop the Repetitive Head Impact Composite Index.
| Active fighters | Retired fighters | Control | p-value | |
|---|---|---|---|---|
| N | 117 (70.9%) | 26 (15.8%) | 22 (13.3%) | |
| Age | 29.9 (6.3) | 47.2 (10.0) | 35.1 (14.7) | <0.0001 |
| Education years | 13.5 (2.0) | 13.7 (2.1) | 14.8 (2.8) | 0.0496 |
| Female | 16 (13.7%) | 1 (3.9%) | 2 (9.1%) | 0.3390 |
| Number of fights | 9.6 (11.3) | 34.3 (16.6) | 0 | <0.0001 |
| Years of fighting | 4.6 (4.4) | 9.7 (5.1) | 0 | <0.0001 |
| Race | 0.5686 | |||
| African American | 26 (22.2%) | 3 (11.5%) | 3 (13.6%) | |
| White | 55 (47.0%) | 16 (61.5%) | 11 (50.0%) | |
| Other | 36 (30.8%) | 7 (26.9%) | 8 (36.4%) |