Table 1.
Association between selected variables and frequency of subjects with positive SARS-CoV-2 nasopharyngeal tests among healthcare workers during the first (February to July 2020) and the second epidemic wave (August 2020 to January 2021) in a research and teaching hospital in Milan, Italy.
| 1st Wave | 2nd Wave | |||||
|---|---|---|---|---|---|---|
| Variable | HCWs | Positives | HCWs | Positives | ||
| N | N | % | N | N | % | |
| All | 3378 | 242 | 7.2 | 4465 | 545 | 12.2 |
| Gender | ||||||
| Women | 2357 | 147 | 6.2 | 3140 | 383 | 12.2 |
| Men | 1021 | 95 | 9.3 | 1325 | 162 | 12.2 |
| p-value | 0.001 | 0.98 | ||||
| Age (years) | ||||||
| <30 | 796 | 49 | 6.2 | 1242 | 109 | 8.8 |
| 30–39 | 810 | 62 | 7.6 | 1136 | 143 | 12.6 |
| 40–49 | 617 | 48 | 7.8 | 795 | 109 | 13.7 |
| 50–59 | 842 | 62 | 7.4 | 939 | 128 | 13.6 |
| 60+ | 313 | 21 | 6.7 | 353 | 56 | 15.9 |
| p-value | 0.73 | <0.001 | ||||
| Occupation | ||||||
| Physicians, including residents | 959 | 83 | 8.6 | 1221 | 134 | 11.0 |
| Nurses, midwives | 1092 | 81 | 7.4 | 1285 | 192 | 14.9 |
| Healthcare assistants | 274 | 29 | 10.6 | 335 | 50 | 14.9 |
| Health technicians a | 359 | 30 | 8.4 | 516 | 69 | 13.4 |
| Clerical workers, technicians | 252 | 10 | 4.0 | 376 | 78 | 20.7 |
| Students | 326 | 5 | 1.5 | 576 | 12 | 2.1 |
| Missing/ill-defined | 116 | 4 | 3.4 | 156 | 10 | 6.4 |
| p-value | <0.001 | <0.001 |
a Including biologists, radiology and laboratory technicians, psychologists, other health technicians.