Seroprevalence of antibodies to SARS-CoV-2 by sociodemographic and other participant characteristics
| Overall | n | Positive (%) | |
| 438 | 370 (84.5) | ||
| Variables | n (%) | Positive(% (95% CI)) | P (χ2 test) |
| Age (years) | |||
| ≤17 | 21 (4.8) | 14(3.2 (1.54 to 4.9)) | 0.0670 |
| 18–30 | 173 (39.5) | 146(33.3 (28.9 to 37.8)) | |
| 31–50 | 174 (39.7) | 153(34.9 (30.5 to 39.4)) | |
| >50 | 70 (16) | 57(13.0 (9.9 to 16.2)) | |
| Sex | |||
| Female | 281 (64.2) | 241(55.0 (50.3 to 59.7)) | 0.3185 |
| Male | 157 (35.8) | 129(29.5 (25.2 to 33.7)) | |
| Employment status (undisclosed was not included in the calculation of significance) | |||
| Unemployed | 164 (39.1) | 137(31.4 (27.0 to 35.7)) | 0.0176 |
| Self-employed | 102 (24.3) | 82(18.8 (15.1 to 22.4)) | |
| Casual/part time | 88 (21.0) | 83(19.0 (15.3 to 22.7)) | |
| Student | 34 (8.1) | 27(6.2 (3.9 to 8.4)) | |
| Formal/regular | 31 (7.4) | 28(6.4 (4.1 to 8.7)) | |
| Not applicable (<16 years) | 18 | 12(2.7 (1.2 to 4.3)) | |
| Undisclosed | 1 | 1(0.23) | |
| Underlying health conditions | |||
| No | 341 (77.9) | 287(65.5 (61.1 to 70.0)) | 0.7364 |
| Yes | 97 (22.1) | 83(19.0 (15.3 to 22.6)) | |
| Types of underlying health conditions | (% of all participants) | ||
| Cardiovascular disease | 40 (9.1) | 32(7.3 (4.9 to 9.8)) | 0.4123 |
| Stomach ulcer | 25 (5.7) | 20(4.6 (2.6 to 6.5)) | 0.5246 |
| HIV | 18 (4.1) | 17(3.9 (2.1 to 5.7)) | 0.2330 |
| Respiratory disease | 14 (3.2) | 12(2.7 (1.2 to 4.3)) | 0.8964 |
| Diabetes | 11 (2.5) | 10(2.3 (0.9 to 3.7)) | 0.5506 |
| On medication | |||
| No | 343 (78.3) | 291(66.4 (62.0 to 70.9)) | 0.6888 |
| Yes | 95 (21.7) | 79(18.0 (14.4 to 21.7)) | |
| COVID-19 symptoms (previous 16 months) | |||
| No | 157 (35.8) | 142(32.4 (28.0 to 36.8)) | 0.0099 |
| Yes | 281 (64.2) | 228(52.1 (47.4 to 56.8)) | |
| Ever tested for SARS-CoV-2 | |||
| No | 371 (84.7) | 311(71.0 (66.7 to 75.3)) | 0.3787 |
| Yes | 67 (15.3) | 59 (10.3 to 16.7) | |
| Previous SARS-CoV-2 test | |||
| Tested with negative result | 54 (80.6) | 48(71.6 (60.6 to 82.7)) | * |
| Tested with positive result | 4 (6.0) | 4(6.0 (0.1 to 11.8)) | |
| Tested with unknown result | 9 (13.4) | 7(10.4 (2.0 to 18.0)) | |
| COVID-19 vaccination | |||
| No | 408 (93.2) | 341(77.9 (74.0 to 81.8)) | 0.0561 |
| Yes | 30 (6.8) | 29(6.6 (4.3 to 9.0)) | |
*No χ2 possible due to a negative value in the tested negative category.