Population characteristics
| Total | IP | CP | Differences between IPs and CPs/p value | |
| Sample n (%) | 8102 (100) | 3218 (39.7) | 4884 (60.3) | |
| Sex n (%) | ||||
| Male | 3081 (38.4) | 1351 (42.5) | 1730 (35.7) | <0.001* |
| Female | 4939 (61.6) | 1828 (57.5) | 3111 (64.3) | |
| Mean age (years; mean and SD)† | 41.7 (14.3) | 42.8 (14.3) | 41.0 (14.2) | <0.001‡ |
| Migration background n (%) | ||||
| No | 7573 (95.0) | 2936 (93.3) | 4637 (96.1) | <0.001* |
| Yes | 399 (5.0) | 211 (6.7) | 188 (3.9) | |
| Education n (%)† | ||||
| High | 6504 (80.8) | 2537 (79.4) | 3967 (81.7) | 0.011* |
| Middle | 1478 (18.4) | 623 (17.6) | 855 (17.6) | |
| Low | 70 (0.9) | 36 (1.1) | 34 (0.7) | |
| Family/household structure n (%) | ||||
| Live alone | 2264 (28.6) | 860 (27.4) | 1405 (29.4) | |
| No of adults (mean and SD) | 1.60 (0.95) | 1.56 (0.93) | 1.62 (0.94) | 0.027‡ |
| Partnership/married | 5661 (71.4) | 2282 (72.6) | 3379 (70.6) | 0.054* |
| Children yes (%) | 2534 (43.8) | 1465 (45.7) | 2069 (42.5) | 0.004* |
| No of children aged <3 years (mean and SD) | 1.16 (0.39) | 1.16 (0.43) | 1.16 (0.36) | 0.824‡ |
| No of children aged 3 to <6 years (mean and SD) | 1.16 (0.39) | 1.17 (0.40) | 1.15 (0.39) | 0.484‡ |
| No of children aged 6 to <10 years (mean and SD) | 1.23 (0.47) | 1.21 (0.45) | 1.24 (0.49) | 0.609‡ |
| No of children aged 10 to <14 years (mean and SD) | 1.18 (0.40) | 1.18 (0.38) | 1.18 (0.41) | 0.877‡ |
| No of children aged 14 to <16 years (mean and SD) | 1.10 (0.30) | 1.07 (0.28) | 1.10 (0.32) | 0.310‡ |
| Living situation with garden and/or balcony (%) | ||||
| Yes | 6841 (84.7) | 2746 (85.6) | 4095 (84.1) | 0.067* |
| No | 1239 (15.3) | 463 (14.4) | 776 (15.9) | |
| Chronic diseases yes, n (%) | 1781 (22.8) | 750 (24.2%) | 1031 (21.8) | 0.016* |
| Quarantine duration days mean (SD) | 11.8 (4.6) | 12.1 (4.9) | 11.6 (4.3) | <0.001‡ |
| Period between quarantine and answering the questionnaire, days mean (SD) | 99.6 (87.6) | 97.1 (87.5) | 101.4 (86.1) | 0.036‡ |
*χ2 test.
†Rounding error.
‡Unpaired t-test.
CP, contact person; IP, infected person.