Table 3.

Sport-Related Concussion (SRC) Rate by Athletic Trainer Availability^a

Athletic Trainer Availability	n	SRCs (%)	Univariable Analysis		Multivariable Analysisb		Univariable Analysis		Multivariable Analysisc
			OR (95% CI)	P Value	OR (95% CI)	P Value	HR (95% CI)	P Value	HR (95% CI)	P Value
Low	747	18 (2.4)	Reference	—	Reference	—	Reference	—	Reference	—
Mid	828	46 (5.6)	2.38 (1.04, 5.48)	.041	2.39 (0.98, 5.82)	.055	2.63 (1.06, 6.52)	.037	2.59 (1.03, 6.53)	.043
High	884	62 (7.0)	3.05 (1.48, 6.31)	.003	3.15 (1.51, 6.60)	.002	3.37 (1.58, 7.21)	.002	3.33 (1.55, 7.13)	.002

Abbreviations: CI, confidence interval; HR, hazard ratio; OR, odds ratio.

^aReported as n (%), ratio estimate (95% CI). Odds ratio estimated from generalized estimating equation model accounting for cluster effect of school. Hazard ratio estimated from Cox-Proportional Hazards model accounting for cluster effect of school.

^bControlling for sex, year, grade, and any previous SRC.

^cControlling for all sex, year, grade, any previous SRC, and session (practice versus competition) and contact sport (basketball, football, ice hockey, soccer, and wrestling: yes/no).