Table 4. Characteristics of the work areas in the plants with many infected employees.
| Work area | Employees (N, %) | Infect-ed | Prevalence (% (95% CI)) | Temperat-ure (Mean (SD)) | Minimum distance less than 1.5 meters (n, %) | Lunch break (n, %) | Maximal outdoor air flow (OAF) (Mean (SD, n)) | OAF per employee (Mean (SD, n)) | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Break freely taken | Fixed breaks not shifted in time | Fixed breaks shifted in time | ||||||||
| Delivery | 38 (0.58%) | 1 | 2.63 (0.47–13.49) | 20.68 (3.43) | 0 (0%) | 6 (1.71%) | 0 (0%) | 32 (0.77%) | 51,470.59 (9,836.91; 17) | 20,176.47 (17,462.23; 17) |
| ASH | 124 (1.9%) | 2 | 1.61 (0.44–5.69) | 21.53 (0.86) | 72 (1.83%) | 0 (0%) | 46 (2.3%) | 78 (1.87%) | 10,282.05 (13,007.39; 78) | 1,884.62 (5,879.75; 78) |
| Slaughter | 524 (8.03%) | 65 | 12.4 (9.85–15.50) | 20.51 (2.13) | 274 (6.97%) | 0 (0%) | 37 (1.85%) | 487 (11.67%) | 30,255.35 (14,805.57; 357) | 730.87 (995.68; 357) |
| Meat cutting area | 3,360 (51.52%) | 542 | 16.13 (14.93–17.41) | 6.51 (2.37) | 2,970 (75.59%) | 0 (0%) | 1435 (71.79%) | 1925 (46.13%) | 21,424.79 (11,481.36; 1,549) | 110.20 (59.43; 1,549) |
| Meat production | 290 (4.45%) | 26 | 8.97 (6.19–12.81) | 8.28 (2.92) | 110 (2.8%) | 0 (0%) | 0 (0%) | 290 (6.95%) | 3,500.0 (0.0; 110) | 31.82 (0.0; 110) |
| Sausage production | 138 (2.12%) | 6 | 4.35 (2.01–9.16) | 8.39 (0.21) | 0 (0%) | 0 (0%) | 0 (0%) | 138 (3.31%) | - | - |
| Smoking of meat | 4 (0.06%) | 0 | 0 (0.00–48.99) | 22.00 (0.00)* | 0 (0%) | 0 (0%) | 0 (0%) | 4 (0.1%) | - | - |
| Packaging | 1,186 (18.18%) | 95 | 8.01 (6.60–9.69) | 6.23 (1.71) | 370 (9.42%) | 0 (0%) | 378 (18.91%) | 808 (19.36%) | 19,279.48 (3,375.56; 458) | 94.98 (17.12; 458) |
| Commissioning | 163 (2.5%) | 23 | 14.11 (9.59–20.28) | 2.78 (1.86) | 0 (0%) | 0 (0%) | 55 (2.75%) | 108 (2.59%) | 20,000.0 (0.0; 55) | 727.27 (0.0; 55) |
| Garage | 188 (2.88%) | 14 | 7.45 (4.49–12.11) | 21.84 (1.26) | 0 (0%) | 3 (0.86%) | 14 (0.7%) | 171 (4.1%) | 450.0 (0.0; 40) | 34.62 (0.0; 40) |
| Cleaning | 14 (0.21%) | 1 | 7.14 (1.27–31.47) | 14.14 (1.41) | 0 (0%) | 0 (0%) | 4 (0.2%) | 10 (0.24%) | - | - |
| Administration | 493 (7.56%) | 14 | 2.84 (1.70–4.71) | 22.00 (0.00) | 133 (3.39%) | 341 (97.43%) | 30 (1.5%) | 122 (2.92%) | 5,000.0 (0.0; 122) | 40.98 (0.0; 122) |
| Overall | 6522 (100%) | 789 | 12.10 (11.33–12.91) | 9.62 (6.46) | 3929 (100%) | 350 (100%) | 1999 (100%) | 4173 (100%) | 20,318.79 (12,561.01; 2786) | 364.32 (2318.48; 2786) |
Abbreviations: SD, standard deviation; 95% CI, 95% confidence interval.