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Table 1 Characteristics of study participants according to the mask policy of the respective health care institution

From: Healthcare institutions’ recommendation regarding the use of FFP-2 masks and SARS-CoV-2 seropositivity among healthcare workers: a multicenter longitudinal cohort study

  FFP-2 masks recommended exclusively for aerosol generating procedures in patients with COVID-19 FFP-2 masks recommended for all interactions with patients with COVID-19
Number of health care institutions 7 6
Number of participants (n = 2794) 1993 801
Age, median (IQR) 42 (31–52) 45 (33–54)
Sex: n (%) female 1579 (79.2%) 618 (77.2%)
Profession   
 Employee without patient exposure 406 (20.4%) 153 (19.1%)
 Nurse 823 (41.3%) 295 (36.8%)
 Physician 305 (15.3%) 71 (8.9%)
 Other employee with patient exposure 459 (23.0%) 282 (35.2%)
Employee in ICU 168 (8.4%) 19 (2.4%)
Employee in COVID-19 ward 186 (9.3%) 60 (7.5%)
Employee in emergency unit 309 (15.5%) 87 (10.9%)
Exposure at baseline (n = 2757)   
Type of patient exposure   
 No patient exposure 601 (30.2%) 244 (30.5%)
 Exposure to non-COVID-19 patients 827 (41.5%) 384 (47.9%)
 Exposure to COVID-19 patients 532 (26.7%) 169 (21.1%)
Exposure to SARS-CoV2 infected co-worker 297 (14.9%) 86 (10.7%)
Non-occupational exposure to SARS-CoV2 infected person 58 (2.9%) 33 (4.1%)
Exposure at follow up (n = 2139)   
Type of patient exposure   
 No patient exposure 499 (30.5%) 210 (35.5%)
 Exposure to non-COVID-19 patients 339 (20.7%) 154 (26.1%)
 Exposure to COVID-19 patients 729 (44.6%) 208 (35.2%)
Exposure to SARS-CoV2 infected co-worker 322 (19.7%) 123 (20.8%)
Non-occupational exposure to SARS-CoV2 infected person 161 (9.8%) 70 (11.8%)
Cumulative regional incidence per 100,000 inhabitants (July 2020/March 2021), mean 340/5298 539/6432