. 2017 Oct;52(10):955–965. doi: 10.4085/1062-6050-52.7.06

Table 4. .

Injury Rates by Number of Plays per Season in Youth Football Players During Games in the 2013 Season

Type of Injury	Plays Per Season, No.										Above-Median Group Versus Below-Median Group Injury Rate Ratio (95% Confidence Interval)
	Below-Median^a Group (n = 1049)					Above-Median^a Group (n = 1049)
	Injury Count	Total Athlete- Plays	Athlete- Exposures	Per 10 000 Athlete-Plays	Per 1000 Athlete- Exposures	Injury Count	Total Athlete- Plays	Athlete- Exposures	Per 10 000 Athlete-Plays	Per 1000 Athlete- Exposures	Rates per 10 000 Athlete-Plays	Rates per 1000 Athlete- Exposures
All injuries	133	196 529	7732	6.77	17.20	196	503 960	8542	3.89	22.95	0.57 (0.46, 0.72)^b	1.33 (1.07, 1.66)^b
Time-loss injuries only	36	196 529	7732	1.83	4.66	50	503 960	8542	0.99	5.85	0.54 (0.35, 0.83)^b	1.26 (0.82, 1.93)
Non–time-loss injuries only	97	196 529	7732	4.94	12.55	146	503 960	8542	2.90	17.09	0.59 (0.45, 0.76)^b	1.36 (1.05, 1.76)^b
Concussion only	12	196 529	7732	0.61	1.55	20	503 960	8542	0.40	2.34	0.65 (0.32, 1.33)	1.51 (0.74, 3.09)

Median = 296.5 plays per season.

Indicates difference (95% confidence interval did not include 1.00).