| Residence |
| Urban area | 1236 | 59.1 |
| Rural area | 857 | 40.9 |
| Age (years) |
| From 18 to 29 | 1195 | 57.1 |
| From 30 to 39 | 539 | 25.8 |
| From 40 to 49 | 279 | 13.3 |
| 50 and above | 80 | 3.8 |
| Sex |
| Female | 1485 | 71.0 |
| Male | 608 | 29.0 |
| Ethnicity |
| Kinh | 1665 | 79.6 |
| Other | 428 | 20.4 |
| Occupation |
| Health staff | 394 | 18.8 |
| Other governmental staff | 463 | 22.1 |
| Worker | 101 | 4.8 |
| Student | 814 | 38.9 |
| Own business | 73 | 3.5 |
| Other | 248 | 11.9 |
| Education |
| High school or lower | 430 | 20.5 |
| Above | 1663 | 79.5 |
| Marital status |
| Single | 1106 | 52.8 |
| Married | 924 | 44.1 |
| Divorced/ Widowed | 63 | 3.0 |
| Family size |
| One | 73 | 3.5 |
| Two | 91 | 4.3 |
| 3 to 4 people | 608 | 29.0 |
| Five or more | 1321 | 63.1 |
| Family economic status |
| Poor, near poor | 101 | 4.8 |
| Others (average, high income) | 1992 | 95.2 |
| Chronic diseases |
| Yes | 124 | 5.9 |
| No | 1969 | 94.1 |
| Allergy |
| Yes | 593 | 28.3 |
| No | 1251 | 59.8 |
| Do not know/remember | 249 | 11.9 |
| Occupational changes due to COVID-19 |
| Yes | 548 | 26.2 |
| No | 1545 | 73.8 |
| Income reduction due to COVID-19 |
| Yes | 778 | 37.2 |
| No | 1315 | 62.8 |
| Current contact level* |
| F1, F2 | 78 | 3.7 |
| F3, F4 | 238 | 11.4 |
| None | 1777 | 84.9 |
| Previous three waves contact (F1 to F4)* |
| Yes | 199 | 9.5 |
| No | 1894 | 90.5 |
| Feeling of being at risk of COVID-19 infection in the near future |
| Yes | 527 | 25.2 |
| No | 443 | 21.2 |
| Do not know | 1123 | 53.7 |