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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