Table 2.
Key summary of cases by phases of the COVID-19 epidemic
| Phase one (31 Dec 2019 to 3 Feb 2020) |
Phase two(4 Feb to 3 Mar 2020) | Phase three(4 Mar to 19 Apr 2020) | Phase four(20 Apr to 31 May 2020) | Total | p-value | |
|---|---|---|---|---|---|---|
| Total | 15 (1.4%) | 85 (7.8%) | 925 (85.3%) | 59 (5.4%) | 1084 | |
| Case classification | ||||||
| Imported case | 12 (80%) | 11 (12.9%) | 581 (62.8%) | 53 (89.8%) | 657 (60.6%) | <0.00001a |
| Linked local case | 2 (13.3%) | 49 (57.6%) | 196 (21.2%) | 3 (5.1%) | 250 (23.1%) | |
| Unlinked local case | 0 (0%) | 19 (22.4%) | 48 (5.2%) | 2 (3.4%) | 69 (6.4%) | |
| Possibly imported case | 1 (6.7%) | 6 (7.1%) | 100 (10.8%) | 1 (1.7%) | 108 (10%) | |
| Mode of case identification | ||||||
| Active notification by medical practitioners | 10 (66.7%) | 0 (0%) | 322 (34.8%) | 4 (6.8%) | 336 (31%) | <0.00001a |
| Contact tracing by CHP | 3 (20%) | 49 (57.6%) | 157 (17%) | 5 (8.5%) | 214 (19.7%) | |
| Enhanced laboratory surveillance in public hospitals | 2 (13.3%) | 32 (37.6%) | 14 (1.5%) | 1 (1.7%) | 49 (4.5%) | |
| Enhanced surveillance at emergency departments, GOPCs, and private sector | 0 (0%) | 4 (4.7%) | 202 (21.8%) | 2 (3.4%) | 208 (19.2%) | |
| Enhanced surveillance for returning travellers | 0 (0%) | 0 (0%) | 230 (24.9%) | 47 (79.7%) | 277 (25.6%) | |
| Age (years) | ||||||
| 0–14 | 0 (0%) | 0 (0%) | 27 (2.9%) | 12 (20.3%) | 39 (3.6%) | <0.00001a |
| 15–24 | 0 (0%) | 6 (7.1%) | 274 (29.6%) | 9 (15.3%) | 289 (26.7%) | |
| 25–44 | 3 (20%) | 15 (17.6%) | 355 (38.4%) | 22 (37.3%) | 395 (36.4%) | |
| 45–64 | 6 (40%) | 36 (42.4%) | 223 (24.1%) | 11 (18.6%) | 276 (25.5%) | |
| 65+ | 6 (40%) | 28 (32.9%) | 46 (5%) | 5 (8.5%) | 85 (7.8%) | |
| Sex | ||||||
| Male | 9 (60%) | 40 (47.1%) | 502 (54.3%) | 37 (62.7%) | 588 (54.2%) | 0. 299a |
| Female | 6 (40%) | 45 (52.9%) | 423 (45.7%) | 22 (37.3%) | 496 (45.8%) | |
| Symptoms | ||||||
| Symptomatic | 15 (100%) | 80 (94.1%) | 744 (80.4%) | 20 (33.9%) | 859 (79.2%) | <0.00001a |
| Asymptomatic | 0 (0%) | 5 (5.9%) | 181 (19.6%) | 39 (66.1%) | 225 (20.8%) | |
| Average daily number of COVID-19 viral tests performed | 161 | 990 | 2283 | 2245 | 1556 | NA |
CHP, Centre for Health Protection; GOPC, general outpatient clinic; NA, not applicable.
a
Chi-square test