TABLE 1.
Baseline characteristics of the population of Basel (City/Land), Fribourg, Neuchâtel, Ticino, Zurich at time of enrolment during CI study phase 2 (June/July 2020) Corona Immunitas, Switzerland 2020.
| Basel (City/Land) | Fribourg | Neuchâtel | Ticino | Zurich | |
|---|---|---|---|---|---|
| N | 2269 | 308 | 284 | 978 | 797 |
| Median age [interquartile range] | 57.0 [46.0; 66.0] | 55.0 [40.0; 67.0] | 57.0 [43.0; 69.0] | 46.0 [36.0; 55.0] | 58.0 [44.0; 70.0] |
| Age categories | |||||
| 20–64 years | 1600, 70.5% | 206, 66.9% | 173, 60.9% | 977, 99.9% | 456, 57.2% |
| 65+ years | 669, 29.5% | 102, 33.1% | 111, 39.1% | 1, 0.1% | 341, 42.8% |
| Sex | |||||
| Female | 1213, 53.5% | 178, 58.0% | 152, 53.5% | 560, 57.4% | 406, 50.9% |
| Male | 1056, 46.5% | 129, 42.0% | 132, 46.5% | 413, 42.4% | 391, 49.1% |
| Other/Missing | 0, 0.0% | 1, 0.3% | 0, 0.0% | 5, 0.5% | 0, 0.0% |
| Citizenship | |||||
| Swiss | 1690, 74.5% | 258, 83.8% | 206, 72.5% | 671, 68.6% | 580, 72.8% |
| Swiss and other (dual citizenship) | 244, 10.8% | 25, 8.1% | 42, 14.8% | 139, 14.2% | 91, 11.4% |
| Other | 651, 14.0% | 64, 7.4% | 77, 11.3% | 172, 17.3% | 126, 15.8% |
| Highest school certificate | |||||
| No school certificate or mandatory school | 52, 2.3% | 15, 4.9% | 18, 6.3% | 31, 3.2% | 26, 3.3% |
| Professional training | 725, 32.0% | 121, 39.3% | 93, 32.7% | 342, 35.0% | 304, 38.1% |
| Matura, baccalaureate, vocational baccalaureate | 148, 6.5% | 34, 11.0% | 43, 15.1% | 191, 19.5% | 57, 7.2% |
| Higher technical college or university of applied sciences | 548, 24.2% | 62, 20.1% | 56, 19.7% | 138, 14.1% | 198, 24.8% |
| University | 790, 34.8% | 75, 24.4% | 73, 25.7% | 264, 27.0% | 203, 25.5% |
| Missing | 6, 0.3% | 1, 0.3% | 1, 0.4% | 12, 1.2% | 9, 1.1% |
| Number of other people currently living in the same household | |||||
| 0 | 424, 18.8% | 50, 16.7% | 49, 17.3% | 143, 14.8% | 141, 17.8% |
| 1 | 1025, 45.4% | 123, 41.0% | 126, 44.4% | 290, 30.1% | 397, 50.0% |
| 2 | 357, 15.8% | 50, 16.7% | 40, 14.1% | 215, 22.3% | 114, 14.4% |
| 3 | 328, 14.5% | 54, 18.0% | 51, 18.0% | 241, 25.0% | 100, 12.6% |
| 4 | 96, 4.2% | 18, 6.0% | 10, 3.5% | 60, 6.2% | 31, 3.9% |
| 5 or more | 29, 1.3% | 5, 1.7% | 8, 2.8% | 15, 1.6% | 11, 1.4% |
| Has at least one child aged 18 or younger at home | 564, 24.9% | 111, 36.0% | 90, 31.7% | 388, 39.7% | 179, 22.5% |
| Current monthly (gross) household income (CHF) | |||||
| 0–3000 | 186, 8.2% | 17, 5.5% | 26, 9.2% | 40, 4.1% | 70, 8.8% |
| 3001–6000 | 504, 22.2% | 77, 25.0% | 67, 23.6% | 195, 19.9% | 209, 26.2% |
| 6001–9000 | 582, 25.7% | 85, 27.6% | 74, 26.1% | 238, 24.3% | 204, 25.6% |
| 9001–12000 | 420, 18.5% | 57, 18.5% | 55, 19.4% | 141, 14.4% | 106, 13.3% |
| 12001–15000 | 205, 9.0% | 25, 8.1% | 16, 5.6% | 81, 8.3% | 66, 8.3% |
| 15001–18000 | 123, 5.4% | 16, 5.2% | 20, 7.0% | 33, 3.4% | 34, 4.3% |
| 18001–21000 | 48, 2.1% | 12, 3.9% | 9, 3.2% | 15, 1.5% | 9, 1.1% |
| 21001 + | 105, 4.6% | 6, 1.9% | 7, 2.5% | 46, 4.7% | 41, 5.1% |
| No answer | 96, 4.2% | 13, 4.2% | 10, 3.5% | 189, 19.3% | 58, 7.3% |
| Work situation | |||||
| Working (part- or full-time) | 1392, 61.3% | 179, 58.1% | 146, 51.4% | 726, 74.2% | 434, 54.5% |
| Retired | 730, 32.2% | 103, 33.4% | 116, 40.8% | 40, 4.1% | 325, 40.8% |
| Experienced a change in professional worklife due to COVID-19 | |||||
| Lost a job due to COVID-19 | 24, 1.1% | 4, 1.3% | 4, 1.4% | 13, 1.3% | 3, 0.4% |
| Working from home (home office) among those working part- or full-time | 607, 43.6% | 79, 44.1% | 53, 36.3% | 274, 37.7% | 212, 48.8% |
| Median Body Mass Index [Interquartile range] | 24.3 [21.9; 27.2] | 24.5 [22.3; 27.4] | 25.1 [22.3; 28.3] | 24.2 [21.3; 27.4] | 24.6 [22.3; 27.7] |
| Smoking status | |||||
| Smoking daily | 227, 10.0% | 30, 9.7% | 32, 11.3% | 189, 19.3% | 87, 10.9% |
| Smoking occasionally | 134, 5.9% | 20, 6.5% | 7, 2.5% | 53, 5.4% | 44, 5.5% |
| Former smoker | 606, 26.7% | 95, 30.8% | 88, 31.0% | 194, 19.8% | 226, 28.4% |
| Never smoked | 1302, 57.4% | 163, 52.9% | 157, 55.3% | 542, 55.4% | 440, 55.2% |
| Self-reported chronic disease associated with an elevated risk for severe SARS-CoV-2 disease course | 1121, 49.4% | 132, 42.9% | 136, 47.9% | 389, 39.8% | 420, 52.7% |
| Respiratory illness | 143, 6.3% | 17, 5.5% | 26, 9.2% | 51, 5.2% | 56, 7.0% |
| Immunocompromised | 91, 4.0% | 17, 5.5% | 17, 6.0% | 39, 4.0% | 32, 4.0% |
| Hypertension | 449, 19.8% | 60, 19.5% | 48, 16.9% | 73, 7.5% | 184, 23.1% |
| Cancer | 69, 3.0% | 10, 3.2% | 8, 2.8% | 11, 1.1% | 26, 3.3% |
| Cardiovascular disease | 153, 6.7% | 22, 7.1% | 18, 6.3% | 26, 2.7% | 74, 9.3% |
| Diabetes | 70, 3.1% | 18, 5.8% | 13, 4.6% | 17, 1.7% | 36, 4.5% |
| Allergies | 617, 27.2% | 57, 18.5% | 71, 25.1% | 278, 28.7% | 208, 26.1% |
| Previous SARS-CoV-2 PCR test results | |||||
| Already has had a positive SARS-CoV-2 test result | 11, 0.5% | 1, 0.3% | 0, 0.0% | 10, 1.0% | 0, 0.0% |
| Has been tested negative for SARS-CoV-2 in the past | 266, 11.7% | 24, 7.8% | 23, 8.1% | 62, 6.3% | 56, 7.0% |
| No test done | 1992, 87.8% | 283, 91.9% | 261, 91.9% | 906, 92.6% | 741, 93.0% |