Table 2.
Key time-to-event intervals for laboratory-confirmed COVID-19 cases by different periods, as of May 17, 2020.
| Percentiles | |||||||||
| N | Mean (95% CI) | SD | 2.5th | 25th | 50th | 75th | 97.5th | P value | |
| Incubation period,∗ d | 102 | 6.51 (5.62–7.40) | 4.58 | 1.54 | 3.47 | 5.33 | 8.17 | 18.44 | |
| Serial interval,† d | 123 | 5.95 (5.24–6.66) | 3.99 | 0.84 | 3.02 | 5.08 | 7.95 | 15.92 | |
| Onset-to-quarantined, d | |||||||||
| Whole period | 392 | 5.36 (4.81–5.91) | 5.53 | 0.7 | 2.1 | 3.72 | 6.62 | 19.79 | – |
| Period 1 | 78 | 7.63 (6.93–8.33) | 3.15 | 2.09 | 5.32 | 7.46 | 9.74 | 14.19 | Ref |
| Period 2 | 197 | 4.49 (3.95–5.03) | 3.9 | 0.78 | 2.04 | 3.39 | 5.62 | 14.73 | <.0001 |
| Period3 | 117 | 4.66 (3.57–5.75) | 6.02 | 0.41 | 1.47 | 2.86 | 5.57 | 19.89 | <.0001 |
| Onset-to-confirmation, d | |||||||||
| Whole period | 660 | 5.07 (4.67∼5.47) | 5.19 | 0.67 | 2 | 3.54 | 6.27 | 18.64 | – |
| Period 1 | 78 | 9.10 (8.29∼9.91) | 3.63 | 2.62 | 6.45 | 8.93 | 11.55 | 16.59 | Ref |
| Period 2 | 255 | 5.63 (5.19∼6.07) | 3.62 | 0.9 | 2.97 | 4.87 | 7.47 | 14.61 | <.0001 |
| Period3 | 327 | 3.33 (2.98∼3.68) | 3.21 | 0.49 | 1.39 | 2.4 | 4.15 | 11.75 | <.0001 |