Table 3.

Effect of self-reporting any days not wearing a mask when interacting with others outside household on self-reported SARS-CoV-2 infection by period

Time	N cases	N controls	aOR	CI lower	CI upper
Pre-Delta	1,592	11,717	1.655	1.433	1.911
Delta	659	4,649	1.527	1.232	1.892
Omicron	1,563	10,960	1.162	1.025	1.317

Conditional logistic regression models (date-matched) adjusted for site, age group, race/ethnicity, urban/rural, vaccination status, healthcare worker occupation, known exposure in the 10 days preceding the match date.