Table 1.
Epidemiological characteristics and risk factors for COVID-19 in the HCWs of the IRCCS Policlinico San Matteo who underwent a nasopharyngeal swab test for SARS-CoV-2 detention from 22 February 2020 to 8 May 2020
| HCWs | All (N = 1447) | COVID-19 cases (N = 164) | Not infected (N = 1283) | * P |
|---|---|---|---|---|
| Age (years) | 45.0 (IQR 33.2–53.4) | 46.3 (IQR 35.4–53.7) | 44.9 (IQR 33.0–53.4) | 0.427 |
| Length of service (years) | 11.3 (IQR 2.0–21.8) | 11.4 (IQR 2.6–20.6) | 11.3 (IQR 2.0–22.3) | 0.918 |
| Sex | ||||
| Men | 440 (30.4%) | 60 (36.6%) | 380 (29.6%) | 0.068 |
| Women | 1007 (69.6%) | 104 (63.4%) | 903 (70.4%) | |
| Job category | ||||
| Administrative staff | 178 (12.3%) | 13 (7.9%) | 165 (12.9%) | 0.24 |
| Health care assistant | 255 (17.6%) | 34 (20.7%) | 221 (17.2%) | |
| Nurse | 568 (39.3%) | 63 (38.4%) | 505 (39.4%) | |
| Physician | 446 (30.8%) | 54 (32.9%) | 392 (30.6%) | |
| Working environment | ||||
| COVID-19 ward | 465 (32.1%) | 97 (59.1%) | 368 (28.7%) | <0.0001 |
| Non-COVID-19 clinical ward | 825 (57.0%) | 60 (36.6%) | 765 (59.6%) | |
| No contact with patients | 157 (10.9%) | 7 (4.3%) | 150 (11.7%) | |
| Contact with CPAP helmets | ||||
| No | 1169 (80.8%) | 91 (55.2%) | 1078 (84.0%) | <0.0001 |
| Yes | 278 (19.2%) | 73 (44.8%) | 205 (16.0%) | |
| BMI (kg/m2) | 23.4 (IQR 20.7–26.5) | 24.4 (IQR 21.8–26.8) | 23.4 (IQR 20.6–26.4) | 0.012 |
| Smoking habit | ||||
| Never | 721 (65.2%) | 113 (68.9%) | 608 (64.5%) | <0.0001 |
| Former | 138 (12.5%) | 33 (20.1%) | 105 (11.1%) | |
| Current | 247 (22.3%) | 18 (11.0%) | 229 (24.3%) | |
| Hypertension | ||||
| No | 1064 (91.5%) | 148 (90.2%) | 916 (91.7%) | 0.538 |
| Yes | 99 (8.5%) | 16 (9.8%) | 83 (8.3%) | |
| Alcohol consumption | ||||
| None | 340 (32.0%) | 34 (28.3%) | 306 (32.5%) | 0.340 |
| Moderate | 677 (63.7%) | 83 (69.2%) | 594 (63.1%) | |
| Not moderate | 45 (4.2%) | 3 (2.5%) | 42 (4.5%) | |
| High | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | |
Notes: COVID-19 = coronavirus-19 disease; HCWs = health care workers; CPAP = continuous positive airway pressure
Data are absolute frequency (% in the group) or median value (interquartile range, IQR).
*We compared COVID-19 versus not-infected HCWs groups using Mann–Whitney U test for quantitative variables and Chi-squared test for qualitative ones. Statistical significance P < 0.05.
Missing data: among 1283 non-infected HCWs, BMI was available for 939, smoking for 942, hypertension for 999 and alcohol for 942, respectively; alcohol consumption information was available for 120 out of 164 COVID-19 cases.