Table 2.

Association of Reported Face Mask Use With the COVID-19 Incidence in Each Sport Among US High School Athletes During Fall 2020^a

Sport	No. (%)	Incidence Rate Ratio (95% CI)	P Value
Baseball	39 (26.4)	1.2 (0.44, 2.93)	.69
Boys' basketball	74 (25.7)	0.53 (0.33, 0.83)	.008
Girls' basketball	78 (22.6)	0.36 (0.19, 0.63)	<.001
Cheer or dance	96 (18.3)	0.75 (0.53, 1.03)	.081
Cross-country	123 (15.7)	0.86 (0.53, 1.31)	.5
Football	94 (14.0)	0.79 (0.59, 1.04)	.10
Boys' golf	69 (18.9)	0.57 (0.17, 1.42)	.28
Boys' soccer	74 (24.5)	1.1 (0.65, 1.71)	.77
Girls' soccer	70 (20.5)	1.3 (0.76, 2.18)	.3
Softball	39 (17.3)	0.53 (0.12, 1.71)	.34
Girls' volleyball	120 (22.0)	0.53 (0.37, 0.73)	<.001

^aIncidence rate ratios and Wald CIs from separate, mixed-effects Poisson models in each sport to predict COVID-19 cases with local incidence, school instruction type, and face mask use (yes or no) as fixed effects, school as a random effect, and log (player-days) as an offset,