Table 1.
Characteristics of the study cohort.
| All groups | COVID-19 | COVID-19 contact group (all health care workers of the hospital with negative SARS-CoV-2-RT PCR) |
Difference between COVID-19 and all other groups, p (Fisher Exact, two-sided) |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Close contact | moderate contact | no contact | |||||||||
| All at follow up (n) | 166 | 27 | 139 | ||||||||
| longitudinal follow up (n) | 127 | 25 | 22 | 39 | 41 | ||||||
| Female, N (%) | 109 | 85.8 % | 22 | 88.0 % | 15 | 68.2 % | 35 | 89.7 % | 37 | 90.2 % | n.s. |
| Male, N (%) | 18 | 14.2 % | 3 | 12.0 % | 7 | 31.8 % | 4 | 10.3 % | 4 | 9.8 % | n.s. |
| Age | |||||||||||
| 18−35 years, N (%) | 37 | 29.1 % | 10 | 40.0 % | 6 | 27.3 % | 10 | 25.6 % | 11 | 26.8 % | n.s. |
| 36−50 years, N (%) | 51 | 40.2 % | 8 | 32.0 % | 9 | 40.9 % | 18 | 46.2 % | 16 | 39.0 % | n.s. |
| 51−65 years, N (%) | 39 | 30.7 % | 7 | 28.0 % | 7 | 31.8 % | 11 | 28.2 % | 14 | 34.1 % | n.s. |
The given numbers refer to absolute case numbers. “All groups” describes all included study participants, “COVID-19“ describes those who suffered from COVID-19. The “COVID-19 contact group” includes all participating health care Workers (HCW) working in the hospital during the described outbreak with negative SARS-CoV-2-RT PCR. Included within this are the groups “close contact“ (unprotected contact with a distance of less than 2 m for 15 minutes or longer), “moderate contact“ (individuals with a negative PCR SARS-CoV-2 test who had moderate contact to a co-worker with COVID-19 or who had recently returned from a risk area) and “no contact“ (no significant contact with COVID-19-patients) [10]. The statistical significances of the differences between the groups were tested using the Fisher Exact Test and are enlisted on the right. “All at follow up” are all study participants at the time of the follow up measurement; “longitudinal follow up“ describes the HCW for whom the data from the follow up analysis was exactly relatable to the results from the baseline antibody-testing. “Female“, “Male“ and “Age“ give the gender- and age-distribution of the study participants within each enlisted group.