Table 3 Study characteristics and results of studies on cause-relating tests
First Author | Study type | Country | Population description | No. pos. tested asymptomatic/ sample size | Setting (Level) | Ward | Period of data collection | Mean Age of HCW | Gender distribution (female in %) |
|---|---|---|---|---|---|---|---|---|---|
Borras-Bermejo et al. [64] | Cohort study | Spain | HCW and residents | n = 2655 Staff: 403/2655 tested positive for COVID-19 144/403 (55.8%) of staff members tested positive were asymptomatic | Nursing homes | Previous laboratory-confirmed cases of COVID-19 | 10.04.–24.04.2020 | N. A | N. A |
Harada et al. [65] | Cross-sectional design | Japan | HCW and patients | 52/697 (7.5%) | Level 3 | N. A | 24.03.–24.04.2020 | N. A | N. A |
Khalil et al. [66] | Cohort study | UK | HCW | 47/266 (18%), 16/47 (34%) were asymptomatic | Level 3 | N. A | 17.03.–16.04.2020 | N. A | N. A |
Rajme-López et al. [67] | Cross-sectional design | Mexico | HCW | 111/2000 (5.5%) | N.A | N. A | 28.04.–08.07.2020 | 34 | 57.5/42.5% |
Rasmussen et al. [68] | Cohort study | Denmark | HCW | 7/347 (1.9%) | Level 4 | N. A | 27.05.–03.06.2020 | N. A | N. A |
Sebastian et al. [69] | Cross-sectional design | Argentina | HCW | 8/204 (4%) | Dental hospital | N. A | 03/–10/2020 | 38 | 64/36% |
Soltani-Zangbar et al. [70] | Cross-sectional design | Iran | HCW | 66/609 (10.8%) | Level 3 | N. A | 04/–06/2020 | 41.9 | 38.75/61.25% |
Zhao et al. [71] | Retrospective cohort study | China | HCW | 88/1172 (9.7%) of HCW with close contact to confirmed cases of COVID-19 | Level 4 | N. A | 14.01.–21.02.2020 | N. A | N. A |