Table 2.
Exposure Variables
| Total sample n = 93 Mean (SD) | High school n = 17 Mean (SD) | College n = 76 Mean (SD) | p value | |
|---|---|---|---|---|
| Concussion history median (IQR)a | 20 (3) | 10 (13) | 20 (39) | 0.0431* |
| CHII | 5805.7 (3091.2) | 3237.6 (1932.4) | 6384.4 (3015.4) | <.0001* |
| Age at first exposure (years) | 10.9 (2.7) | 10.8 (2.7) | 11.0 (2.7) | 0.884 |
| Average years of youth football | 3.3 (2.5) | 3.4 (2.3) | 3.3 (2.5) | 0.931 |
| Seasons of football play | 11.1 (4.2) | 7.1 (3.1) | 12.0 (3.1) | <0.0001 |
| Time since retirement (years) | 26.3 (14.2) | 26.4 (12.2) | 26.3 (14.4) | 0.971 |
Numbers in parentheses are standard deviations except when otherwise indicated.
a
Interviewers read participants a current definition of concussion (methods described elsewhere47) and asked to estimate their concussion history based on that definition.
*
Wilcoxon two sample test.
IQR, interquartile range; CHII, Cumulative Head Impacts Index.