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Distribution of Laboratory-Confirmed Diagnoses of SARS-CoV-2 Infections in the Three Waves.
| Period | Positive HCWs | Chi-Square Test | ||
|---|---|---|---|---|
| n | % | (p Value) | ||
|
1st wave
(6814 NST) |
12/03/20–31/08/20 | 34 | 7% | <0.001 * |
|
2nd wave
(41780 NST) |
01/09/20–31/12/20 | 326 | 63% | |
|
3rd wave
(83629 NST) |
01/01/21–31/08/21 | 159 | 30% | |
| Total | 519 | 100% | ||
* p-value refers to the difference in the frequency of positive HCWs in the three waves (1st wave vs. 2nd wave vs. 3rd wave).
