Table 2.

Self-reported behavioral characteristics, 10 days preceding match date

	Case participants (self-reported positive test)	Control participants (never self-reported positive test)	P-value*
N	3,901	27,813
Daily survey response rate	0.731±0.297	0.653±0.327	<.001
Any days interaction without mask†			<.001
No (no days)	2,244 (57.5%)	17,706 (63.7%)
Yes (at least 1 day)	1,657 (42.5%)	10,107 (36.3%)
Proportion days interaction without mask†	0.18±0.28	0.16±0.28	<.001
Any known exposure			<.001
No	1,789 (45.9%)	25,227 (90.7%)
Yes	2,112 (54.1%)	2,586 (9.3%)
Any days reporting at least one symptoms			<.001
No	703 (18.0%)	20,174 (72.7%)
Yes	3,192 (82.0%)	7,593 (27.3%)
Any days reporting 3+ symptoms			<.001
No	1,642 (42.1%)	25,747 (92.6%)
Yes	2,259 (57.9%)	2,066 (7.4%)
Sought treatment			<.001
No	3,086 (79.1%)	26,780 (96.3%)
Yes	815 (20.9%)	1,033 (3.7%)

^⁎P-values for Pearson's Chi-squared test for categorical variables and Welch's 2-sample t-test for continuous variables.

^†Participants who responded “No” to the question: “In the last 24 hours, have you worn a face mask or face covering every time you interacted with others (not in your household) within a distance of less than 6 feet?.”