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.