Table 1.
Characteristics of the population studied and acquired COVID-19 infection from March 1, 2020 to February 28, 2021.
| Covid-19+ | Covid 19− | Total | p | |
|---|---|---|---|---|
| Total n. (%) | 578 (13.6) | 3673 (86.4) | 4.251 (100) | |
| Women n. (%) | 394 (68.2) | 2550 (69.4) | 2.944 (69.3) | 0.542 |
| Age mean (SD) | 44.7 ± 11.1 | 47.2 ± 10.6 | 46.9 ± 10.7 | 0.000 |
| Age classes n. (%) | ||||
| < 31 | 87 (15.1) | 335 (9.1) | 422 (9.9) | 0.000 |
| 31–40 | 115 (19.9) | 660 (18.0) | 775 (18.2) | |
| 41–50 | 170 (29.4) | 1061 (28.9) | 1231 (29.0) | |
| 51–60 | 175 (30.3) | 1325 (36.1) | 1500 (35.3) | |
| > 60 | 31 (5.4) | 292 (7.9) | 323 (7.6) | |
| HCWs n. (%) | 522 (90.3) | 3232 (88.0) | 3755 (88.3) | 0.110 |
| Non-HCWs n. (%) | 56 (9.7) | 440 (12.0) | 496 (11.7) | |
| Physicians n. (%) | 78 (13.5) | 539 (14.7) | 617 (14.5) | 0.000 |
| Nurses n. (%) | 261 (45.2) | 1459 (39.7) | 1720 (40.5) | |
| Nurses aids n. (%) | 126 (21.8) | 619 (16.9) | 745 (17.5) | |
| Others HCW n. (%) | 57 (9.9) | 615 (16.7) | 673 (15.8) | |
| Technicians n. (%) | 20 (3.5) | 201 (5.5) | 221 (5.2) | |
| Clerks n. (%) | 36 (6.2) | 239 (6.5) | 275 (6.5) | |
| Wards | ||||
| Geriatric I n. (%) | 20 (46.51) | 23 (53.49) | 43 (100) | 0.000 |
| Infective diseases n. (%) | 23 (47.9) | 25 (52.1) | 48 (100) | |
| Long-term Covid n. (%) | 26 (57.8) | 19 (42.2) | 45 (100) | |
| Medicine I and II n. (%) | 57 (27.9) | 147 (72.1) | 204 (100) | |
| Emergency medicine n. (%) | 18 (30.5) | 41 (69.5) | 59 (100) | |
| Pulmonology n. (%) | 26 (21.85) | 93 (78.15) | 119 (100) | |
| First aids n. (%) | 51 (18.75) | 221 (81.25) | 272 (100) | |
| Rehabilitation n. (%) | 22 (22.2) | 77 (77.8) | 99 (100) | |
| Others n. (%) | 126 (9.7) | 1175 (90.3) | 1301 (100) | |
| Surgeries n. (%) | 95 (10.5) | 814 (89.5) | 909 (100) | |
| Administration/technicians n. (%) | 50 (11.9) | 371 (88.1) | 421 (100) | |
| Anesthesia and resuscitation n. (%) | 17 (8.6) | 181 (91.4) | 198 (100) | |
| Other medicines n. (%) | 26 (7.3) | 329 (92.7) | 355 (100) | |
| Radiology and nuclear medicine n. (%) | 21 (11.8) | 157 (88.2) | 178 (100) | |
| N° PCR tests per person, median (IQR) | 14 (10–19) | 10 (7–10) | 10 (7–14) | 0.03 |
| Symptoms at the first PCR + n. (%) | 301 (52.1) | – | 301 (52.1) | |
| Symptoms recorded at the last PCR + n. (%) | 483 (83.6) | – | 483 (83.6) | |
| Asymptomatic n. (%) | 95 (16.4) | – | 95 (16.4) | |
| Upper respiratory symptoms n. (%) | 315 (54.5) | – | 315 (54.5) | |
| Fever > 37.5° C n. (%) | 273 (47.2) | – | 273 (47.2) | |
| Loss of taste and smell n. (%) | 161 (27.8) | – | 161 (27.8) | |
| Lower respiratory symptoms n. (%) | 33 ( 5.7) | – | 33 (5.7) | |
| Diarrhea n. (%) | 35 ( 6.0) | – | 35 (6.0) | |
| Others (myalgia, malaise, headache) (%) | 249 ( 43) | – | 249 (43) | |