Table 1.
Characteristics of participants (n = 13,291), Corona Immunitas study, Switzerland, May 2020—September 2021
| Sociodemographic characteristics | |
| Sex | |
| Female | 53% |
| Male | 47% |
| Age group | |
| ≥ 65 | 39% |
| 20–64 | 61% |
| Children in the household | |
| No children | 77% |
| One child | 9% |
| More than one child | 14% |
| Socioeconomic characteristics | |
| Educational levela | |
| Tertiary | 46% |
| Secondary | 48% |
| Primary | 6% |
| Household income | |
| > CHF 9000 | 34% |
| CHF > 6000–9000 | 28% |
| CHF > 3000–6000 | 28% |
| CHF ≤ 3000 | 10% |
| Employment status | |
| Retired | 38% |
| Outside the labour forceb | 10% |
| Self employed | 10% |
| Employed | 42% |
| Health status | |
| Body Mass Index | |
| < 18.5 | 3% |
| 18.5–24.9 | 52% |
| 25–29.9 | 33% |
| ≥ 30 | 12% |
| Comorbiditiy scorec | |
| 0 | 53% |
| 1 | 32% |
| ≥ 2 | 15% |
| Smoking | |
| Non-smoker | 84% |
| Smoker | 16% |
| Preventive behaviours | |
| Physical distancing during previous 7 days | |
| Frequently | 91% |
| Occasionally/rarely | 9% |
| Staying at home during previous 7 days | |
| Frequently | 69% |
| Occasionally/rarely | 31% |
| Wearing mask during previous 7 days | |
| Frequently | 83% |
| Occasionally/rarely | 17% |
| Hygiene measures during previous 7 days | |
| Frequently | 94% |
| Occasionally/rarely | 6% |
aInternational Standard Classification of Education (ISCED)
bOutside the labour force includes participants in training/studying and unemployed participants
cComorbidity score goes from 0 to ≥ 2 and was calculated using the following possible answers: cancer; immunological diseases; cardiovascular diseases or diabetes or hypertension; respiratory diseases; allergies