Table 1.
Characteristics of the study population stratified by binary SenASTrIS antibody test result
| Variable | Negative a (n = 1980) | Positive a) (n = 413) |
|---|---|---|
| SARS-CoV-2 symptoms and tests | ||
| Prior PCR-confirmed SARS-CoV-2 infection | 15 (0.8) | 128 (31.2) |
| Symptoms b | ||
| None | 816 (42.2) | 93 (22.8) |
| < 3 | 323 (16.7) | 51 (12.5) |
| ≥ 3 | 795 (41.1) | 264 (64.7) |
| Primary exposure | ||
| Number of children in household c | 0.59 (±0.92) | 0.70 (±1.01) |
| Children in household | ||
| None | 1296 (66.0) | 252 (61.3) |
| Any child 0–5 years | 276 (14.1) | 64 (15.6) |
| Any child 6–11 years | 279 (14.2) | 71 (17.3) |
| Any child 12–17 years | 296 (15.1) | 72 (17.5) |
| Child with PCR-confirmed infection | 17 (0.9) | 13 (3.2) |
| Sociodemographic characteristics | ||
| Age c) | 45·04 (±12.3) | 43·97 (±11.9) |
| Male gender | 917 (46.4) | 202 (49.0) |
| Household monthly income (CHF) d | ||
| < 6000 | 521 (28.0) | 113 (29.4) |
| 6000–<12,000 | 908 (48.8) | 176 (45.8) |
| 12,000–<18,000 | 314 (16.9) | 65 (16.9) |
| ≥ 18,000 | 116 (6.2) | 30 (7.8) |
| Swiss nationality | 1681 (85.4) | 346 (84.2) |
| Highest education | ||
| Primary | 83 (4.2) | 17 (4.1) |
| Secondary | 878 (44.7) | 162 (39.5) |
| Tertiary | 1002 (51.0) | 231 (56.3) |
| Other household characteristics | ||
| Number of other people in the household c | 1.86 (±1.29) | 1.99 (±1.34) |
| ≥ 1 other adult in household | 1678 (85.4) | 356 (86.6) |
| Number of other adults in the household c | 1.25 (±0.91) | 1.23 (±0.92) |
| Employment status and other exposure | ||
| Being unemployed or working full-time from home | 879 (47.1) | 141 (36.2) |
| ≥ 1 contact outside the household during the previous 7 days | 1608 (83.2) | 335 (83.8) |
| Number of contacts outside the household during previous 7 days c | 8·58 (±27.2) | 9·80 (±21.8) |
| Notification by SwissCOVID App about contact tested positive | 51 (5.4) | 18 (10.4) |
| Health-related history | ||
| Any chronic conditions e | 338 (17.2) | 74 (18.0) |
| Cancer | 16 (0.8) | 2 (0.5) |
| Diabetes | 30 (1.5) | 11 (2.7) |
| Immunocompromised | 51 (2.6) | 10 (2.4) |
| Hypertension | 184 (9.4) | 32 (7.8) |
| Cardiovascular disease | 35 (1.8) | 11 (2.7) |
| Chronic respiratory disease | 106 (5.4) | 26 (6.3) |
| Smoking tobacco products | 481 (24.4) | 98 (23.8) |
If not indicated otherwise, data are presented as count (%)
aIndeterminate results (n = 44) were all confirmed “indeterminate” and thus considered negative
bAny of the following: fever (subjective), fever (higher 38°C), cough, rhinorrhoea, sneezing, sore throat, shortness of breath, trouble breathing, headache, myalgia, chest pain, fatigue, loss of appetite, nausea, diarrhoea, upset stomach, and anosmia for at least 3 days
cPresented as mean with (± standard deviation)
dIn 2020 on average 1 CHF was equal to 0.93 €, and
eAny of the following: cancer, diabetes, immunocompromised, hypertension, cardiovascular disease, and chronic respiratory disease