Table 2. Baseline Characteristics in APOE ε4–Negative vs APOE ε4–Positive Players.
| Characteristic | Players | P Value | |
|---|---|---|---|
| APOE ε4 Negative (n = 271) | APOE ε4 Positive (n = 81) | ||
| Age, median (IQR), y | 23 (21-29) | 23 (21-27) | .64 |
| Educational level, mean (SD), y | 15.7 (2.7) | 15.6 (3.2) | .86 |
| Years playing soccer at similar frequency, median (IQR)a | 11 (6-16) | 1.5 (8-16) | .49 |
| CogState ISRL score, mean (SD) | 9.5 (1.8) | 9.5 (1.8) | .86 |
| Male sex, No. (%) | 198 (73) | 58 (72) | .80 |
| Race/ethnicity, No. (%) | |||
| White | 185 (68) | 50 (62) | .10 |
| African American | 39 (14) | 22 (27) | |
| Asian | 16 (6) | 4 (5) | |
| Native Hawaiian or Pacific Islander | 4 (1) | 0 | |
| Declined to answer | 27 (10) | 5 (6) | |
| Past or present smoker, No. (%) | 84 (31) | 18 (22) | .13 |
| Alcoholic drinks per wk, No. (%) | |||
| 0 | 62 (23) | 22 (27) | .51 |
| 1-2 | 116 (43) | 33 (41) | |
| 3-7 | 75 (28) | 18 (22) | |
| 8-14 | 17 (6) | 7 (9) | |
| >14 | 1 (0.4) | 1 (1) | |
| Lifetime concussion(s), No. (%)a | |||
| 0 | 166 (61) | 57 (70) | .20 |
| 1 | 48 (18) | 8 (10) | |
| ≥2 | 52 (19) | 15 (19) | |
Abbreviations: APOE, apolipoprotein E; IQR, interquartile range; ISRL, International Shopping List Delayed Recall.
a
Data missing in 6 participants.