Demographic details of participants
| All participants N (%) | Hospital staff n (%) | Preprocedural patients n (%) | |
| Total | 857 | 675 | 182 |
| Median age, years (25th–75th percentile) | 37 (27–45) | 36.5 (28–45) | 37 (25–53) |
| Male | 207 (24.1%) | 145 (21.5%) | 62 (34.1%) |
| Female | 640 (74.7%) | 521 (77.2%) | 119 (65.4%) |
| Unspecified | 10 (1.2%) | 9 (1.3%) | 1 (0.5%) |
| Thai | 847 (98.8%) | 671 (99.4%) | 176 (96.7%) |
| Non-Thai | 10 (1.2%) | 4 (0.6%) | 6 (3.3%) |
| Region | |||
| North | 61 (7.1%) | 59 (8.8%) | 2 (1.1%) |
| Northeast | 269 (31.4%) | 220 (32.6%) | 49 (26.9%) |
| Central | 244 (28.5%) | 183 (27.1%) | 61 (33.5%) |
| South | 109 (12.7%) | 88 (13.0%) | 21 (11.6%) |
| East | 174 (20.3%) | 125 (18.5%) | 49 (26.9%) |
| History of travel to high-risk area | |||
| Yes | 51 (6.0%) | 20 (3.0%) | 31 (17.0%) |
| No | 806 (94.0%) | 655 (97.0%) | 151 (83.0%) |
| History of close contact confirmed case | |||
| Yes | 132 (15.4%) | 121 (17.9%) | 11 (6.0%) |
| No | 725 (84.6%) | 554 (82.1%) | 171 (94.0%) |
| Asymptomatic | 690 (80.5%) | 566 (83.9%) | 124 (68.1%) |
| Symptomatic | 167 (19.5%) | 109 (16.1%) | 58 (31.9%) |
| Fever | 49 (5.7%) | 17 (2.5%) | 32 (17.6%) |
| Cough | 83 (9.7%) | 52 (7.7%) | 31 (17.0%) |
| Rhinitis | 64 (7.5%) | 47 (7.0%) | 17 (9.3%) |
| Sore throat | 55 (6.4%) | 37 (5.5%) | 18 (9.9%) |
| Dyspnoea | 30 (3.5%) | 3 (0.4%) | 27 (14.8%) |
| Previous nasopharyngeal PCR status | |||
| Negative | 124 (14.5%) | 77 (11.4%) | 47 (25.8%) |
| Never tested | 733 (85.5%) | 598 (88.6%) | 135 (74.2%) |
Data were presented in counts and percentages unless otherwise specified.