Table 1.
Factors associated with a positive serological test on June 20. Bivariate analysis
| All sample | Negative serology | Positive serology | P-value | OR | |
|---|---|---|---|---|---|
| N = 1691 | N = 1486 | N = 203 | (95% CI) | ||
| Sociodemographic data | |||||
| Sex (% women) | 1328 (78.5%) | 1174 (79.0%) | 152 (74.9%) | 0.179 | 1.26 (0.90–1.76) |
| Age (±SD) | 42.3 (12.0) | 42.5 (12.1) | 40.9 (11.5) | 0.078 | 0.99 (0.98–1.00) |
| Living alone | 141 (8.3%) | 127 (8.5%) | 14 (6.9%) | 0.425 | 0.79 (0.48–1.41) |
| Living with health care workers | 319 (18.9%) | 270 (18.2%) | 49 (24.1%) | 0.042 | 1.43 (1.01–2.03) |
| Clinical data | |||||
| Hospitalization in the previous year | 82 (4.8%) | 65 (4.4%) | 17 (8.4%) | 0.013 | 1.99 (1.15–3.48) |
| Had a flu vaccine last season | 424 (25.1%) | 362 (24.4%) | 62 (30.5%) | 0.057 | 1.37 (0.99–1.88) |
| Had a tuberculosis vaccine at some time | 354 (20.9%) | 319 (21.5%) | 35 (17.2%) | 0.165 | 0.76 (0.52–1.12) |
| Had a pneumococcal vaccine | 169 (10.0%) | 148 (10.0%) | 21 (10.3%) | 0.864 | 1.04 (0.64–1.69) |
| Smoking habit | |||||
| Not current smoker | 1334 (79.0%) | 1149 (73.5%) | 185 (91.1%) | <0.001 | 10.33 (0.20–0.55) |
| Current smoker | 355 (21.0%) | 337 (22.7%) | 18 (8.9%) | ||
| Been diagnosed with COVID 19 | 165 (9.8%) | 20 (1.3%) | 145 (71.4%) | <0.001 | 183.3 (107.2–313.2) |
| Labor data | |||||
| Occupational category | |||||
| 1. Physician | 324 (19.2%) | 281 (18.9%) | 43 (21.2%) | 0.441 | 1.15 (0.80–1.65) |
| 2. Nurse | 472 (27.9%) | 395 (26.6%) | 76 (37.4%) | 0.001 | 1.65 (1.22–2.25) |
| 3. Nursing aid | 326 (19.3%) | 279 (18.8%) | 46 (22.7%) | 0.188 | 1.27 (0.89–1.81) |
| All HCW (1 + 2 + 3) | 1120 (66.3%) | 955 (64.3%) | 165 (81.3%) | <0.001 | 2.41 (1.67–3.49) |
| 4. Other HCW | 132 (7.8%) | 124 (8.3%) | 8 (3.9%) | 0.028 | 0.45 (0.22–0.94) |
| 5. Patient transporters | 34 (2.0%) | 32 (2.2%) | 2 (1.0%) | 0.266 | 0.45 (0.11–1.91) |
| 6. Administration staff | 176 (10.4%) | 159 (10.7%) | 17 (8.4%) | 0.309 | 0.76 (0.45–1.29) |
| 7. Cleaning staff | 102 (6.0%) | 97 (6.5%) | 5 (2.5%) | 0.023 | 0.36 (0.15–0.90) |
| 8. Other non-health care staff | 115 (6.8%) | 109 (7.3%) | 6 (3.0%) | 0.020 | 0.38 (0.17–0.89) |
| 9. Steering committee | 10 (0.6%) | 10 (0.7%) | 0 | 0.619 | – |
| Normal workplace | |||||
| 10. ICU | 164 (9.7%) | 151 (10.2%) | 13 (6.4%) | 0.090 | 0.61 (0.34–1.09) |
| 11. Hospitalization | 742 (43.9%) | 632 (42.5%) | 109 (53.7%) | 0.003 | 1.57 (1.17–2.10) |
| 12. Outpatient clinics | 348 (20.6%) | 309 (20.8%) | 39 (19.2%) | 0.601 | 0.91 (0.63–1.31) |
| 13. Surgery | 269 (15.9%) | 250 (16.8%) | 19 (9.4%) | 0.006 | 0.51 (0.31–0.84) |
| 14. Emergencies | 390 (23.1%) | 344 (23.1%) | 45 (22.2%) | 0.755 | 0.95 (0.67–1.35) |
| 15. Day hospital | 147 (8.7%) | 132 (8.9%) | 15 (7.4%) | 0.479 | 0.82 (0.47–1.43) |
| 16. Non-healthcare assistance | 296 (17.5%) | 274 (18.4%) | 22 (10.8%) | 0.008 | 0.54 (0.34–0.85) |
| 17. Laboratory | 84 (5.0%) | 81 (5.5%) | 3 (1.5%) | 0.015 | 0.26 (0.08–0.83) |
| 18. Pharmacy | 67 (4.0%) | 63 (4.2%) | 4 (2.0%) | 0.120 | 0.45 (0.16–1.26) |
| 19. Radiology | 109 (6.4%) | 102 (6.9%) | 7 (3.4%) | 0.063 | 0.49 (0.22–1.06) |
| Frontline attention | |||||
| 20. Was not frontline | 711 (42.1%) | 651 (43.8%) | 60 (29.6%) | <0.001 | 11.39 (0.89–2.17) |
| 21. Frontline, NOT feeling unprotected | 299 (17.7%) | 265 (17.8%) | 34 (16.7%) | 2.08 (1.49–2.90) | |
| 22. Frontline feeling unprotected | 679 (40.2%) | 570 (38.4%) | 109 (53.7%) | ||
| Kept a safe distance of 1.5 m in communal areas when not wearing a mask | 1459 (86.3%) | 1293 (87.0%) | 164 (80.8%) | 0.016 | 0.63 (0.43–0.92) |
| Been in close contact without protection with patients diagnosed with COVID at work. | 388 (22.9%) | 319 (21.5%) | 68 (33.5%) | <0.001 | 1.84 (1.34–2.53) |
| Been in close contact without protection with workers diagnosed with COVID at work. | 513 (30.3%) | 445 (29.9%) | 68 (33.5%) | 0.302 | 1.18 (0.86–1.61) |
| Been in close contact without protection with family members diagnosed with COVID | 89 (5.3%) | 67 (4.5%) | 22 (10.8%) | <0.001 | 2.57 (1.55–4.27) |
| Been in close contact with other people diagnosed with COVID outside work | 72 (4.3%) | 60 (4.0%) | 12 (5.9%) | 0.215 | 1.49 (0.79–2.83) |