Table 2.

Comparison of All Anterior Cruciate Ligament Injuries by Season Segment and Sex

Variable	Preseason			Regular Season			Postseason			Incidence Rate Ratio
	No.	AEs	Rate per 10 000 AEs (95% CI)	No.	AEs	Rate per 10 000 AEs (95% CI)	No.	AEs	Rate per 10 000 AEs (95% CI)	Regular Season Versus Preseason	Postseason Versus Preseason	Postseason Versus Regular Season
All injuries
Males	39	584 216	0.67 (0.46, 0.88)	127	1 476 792	0.86 (0.71, 1.01)	6	131 626	0.46 (0.09, 0.82)	1.29 (0.90, 1.84)	0.68 (0.29, 1.61)	0.53 (0.23, 1.20)
Females	80	543 850	1.47 (1.15, 1.79)	264	1 432 795	1.84 (1.62, 2.06)	13	113 495	1.15 (0.52, 1.76)	1.25 (0.98, 1.61)	0.78 (0.43, 1.40)	0.62 (0.36, 1.08)
All	119	1 104 451	1.05 (0.87, 1.24)	391	2 077 031	1.34 (1.21, 1.48)	19	189 005	0.78 (0.43, 1.12)	1.27 (1.04, 1.56)a	0.73 (0.45, 1.19)	0.58 (0.36, 0.91)a
Noncontact injuries
Males	23	584 216	0.39 (0.23, 0.55)	72	1 476 792	0.49 (0.37, 0.60)	3	131 626	0.23 (0.00, 0.49)	1.24 (0.77, 1.98)	0.58 (0.17, 1.93)	0.47 (0.15, 1.48)
Females	52	543 850	0.96 (0.70, 1.22)	163	1 432 795	1.14 (0.96, 1.31)	7	113 495	0.62 (0.16, 1.07)	1.19 (0.87, 1.63)	0.65 (0.29, 1.42)	0.54 (0.25, 1.16)
All	75	1 128 066	0.66 (0.51, 0.82)	235	2 909 587	0.81 (0.70, 0.91)	10	245 121	0.41 (0.16, 0.66)	1.21 (0.94, 1.58)	0.61 (0.32, 1.19)	0.51 (0.27, 0.95)a

Abbreviations: AE, athlete-exposure; CI, confidence interval.

^aP < .05.