Additional file 1 of Impact of respirator versus surgical masks on SARS-CoV-2 acquisition in healthcare workers: a prospective multicentre cohort

Additional file 1. Table S1. List of participating health care institutions with local mask policies (FFP2 or surgical masks), self-reported global adherence, number of healthcare workers (HCW) participating in the study, self-reported FFP2 use in contact with COVID-19 patients, and SARS-CoV-2 seroprevalence among healthcare workers. Table S2. Description and categorization of variables used in analyses. Table S3. Multivariable Cox regression analysis (full model and sensitivity analyses) with outcome ���Time to first SARS-CoV-2- positive nasopharyngeal PCR/rapid antigen test���. Table S4. Complete case analysis excluding observations with missing values: A) Cox regression (outcome time to first SARS-CoV-2 positive swab); B) multivariable logistic regression (outcome SARS-CoV-2 seroconversion). Table S5. Results of multivariable logistic regression analysis (full model and sensitivity analyses) regarding outcome ���SARS-CoV-2 seroconversion���. Table S6. Subgroup analysis of HCW with frequent COVID-19 exposure vs. HCW with less frequent COVID-19 exposure; A) Cox regression (outcome SARS-CoV-2 positive swab); B) multivariable logistic regression (outcome SARS-CoV-2 seroconversion). Table S7. Subgroup analysis of HCW performing AGP: A) Cox regression (outcome SARS-CoV-2 positive swab); B) multivariable logistic regression (outcome SARS-CoV-2 seroconversion).