Table 5.
Risk factors for mild traumatic brain injury in Calgary MMA athletes from January 2010 to December 2015
Variables | Unadjusted OR (95% CI) | P value | Adjusted OR (95% CI)* | P value |
Set 1 | ||||
Age (years) | 0.99 (0.95 to 1.04) | 0.776 | 0.99 (0.95 to 1.04) | 0.792 |
Sex | ||||
Female | Reference | – | Reference | – |
Male | 1.49 (0.34 to 6.48) | 0.597 | 0.88 (0.18 to 4.28) | 0.87 |
Weight (pounds) | 1.01 (1.00 to 1.02) | 0.01 | 1.01 (1.00 to 1.02) | 0.063 |
Bout length (seconds) | 0.997 (0.996 to 0.998) | <0.01 | 0.997 (0.996 to 0.998) | <0.01 |
Bout type | ||||
Non-title | Reference | – | Reference | – |
Title | 1.40 (0.63 to 3.10) | 0.407 | 2.00 (0.90 to 4.65) | 0.108 |
Set 2 | ||||
Referee | ||||
<50 bouts experience | Reference | – | Reference | – |
≥50 bouts experience | 1.08 (0.66 to 1.75) | 0.766 | 1.01 (0.56 to 1.83) | 0.964 |
Country of origin | ||||
Canada | Reference | – | Reference | – |
Non-Canadian | 1.55 (0.83 to 2.90) | 0.17 | 1.60 (0.82 to 3.13) | 0.172 |
Prior experience (number) | 1.00 (0.97 to 1.04) | 0.884 | 0.98 (0.94 to 1.02) | 0.288 |
Level of competition | ||||
Amateur | Reference | – | Reference | – |
Professional | 1.38 (0.88 to 2.17) | 0.165 | 1.53 (0.88 to 2.65) | 0.128 |
Matchmaker | ||||
Others | Reference | – | Reference | – |
Dominant matchmaker | 0.81 (0.50 to 1.30) | 0.374 | 0.84 (0.48 to 1.47) | 0.538 |
*Multivarible logistic regression of injured to non-injured after controlling for other variables in the set.
MMA, mixed martial arts.