Table 1 Demographic table for baseline data
From: Blood biomarkers and neurodegeneration in individuals exposed to repetitive head impacts
| Â | Active boxer | Retired boxer | Active MMA | Control | p-value |
|---|---|---|---|---|---|
N | 140 | 69 | 211 | 52 | Â |
Age in years (IQR) | 31.03 (26–35) | 48.75 (43–54) | 30 (27–33) | 35.62 (26–44) |  < 0.0001 |
Education years (IQR) | 13.06 (12–14) | 12.74 (12–14) | 13.69 (12–16) | 14.96 (12.5–16) |  < 0.0001 |
Number of fights (IQR) | 13.46 (3–22) | 38.41 (26–50) | 12.95 (3–19) | 0 |  < 0.0001 |
Years of fighting (IQR) | 4.44 (1–8) | 10.7 (9–15) | 3.49 (1–8) | 0 |  < 0.0001 |
ApoE e4 positivity | 35 (31.25%) | 15 (24.19%) | 42 (23.73%) | 15 (31.91%) | 0.0014 |
Male | 130 (92.86%) | 65 (94.20%) | 178 (84.36%) | 39 (75.00%) | Â |
Race |  |  |  |  |  < 0.0001 |
 African American | 48 (34.29%) | 28 (40.58%) | 25 (11.85%) | 3 (5.77%) |  |
 White | 42 (30.00%) | 30 (43.48%) | 122 (57.82%) | 32 (61.54%) |  |
 American Indian/native | 0 | 0 | 4 (1.90%) | 0 |  |
 Asian | 5 (3.57%) | 0 | 7 (3.32%) | 6 (11.54%) |  |
 PI | 3 (2.14%) | 0 | 10 (4.74%) | 0 |  |
 Multiracial | 7 (5.00%) | 3 (4.35%) | 14 (6.64%) | 3 (5.77%) |  |
 Others | 35 (25.00%) | 9 (13.04%) | 31 (14.69%) | 8 (15.38%) |  |