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. 2018 Jul 5;4(1):e000348. doi: 10.1136/bmjsem-2018-000348

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.