Key population and COVID-19 testing data from each of the four countries
| Population data | Singapore | Japan | USA | UK |
| Total tests (per million) | 20 815 | 1166 | 16 507 | 9867 |
| Total tests (thousands) | 122 | 147 | 5500 | 669 |
| Population (millions) | 5.8 | 126.5 | 331 | 67.9 |
| Confirmed COVID-19 positive | 12 693 | 13 182 | 899 281 | 148 381 |
| Cases per thousand inhabitants | 2.2 | 0.1 | 2.7 | 2.3 |
| Case fatality rate (%) | <0.1 | 2.7 | 5.6 | 13.6 |
| Physicians per 10 000 head of capita | 24 | 24 | 25 | 28 |