Table 3. Estimated incubation periods for coronaviruses from different studies.
| Study | Virus (location) |
Distribution | Mean (days) | 95th percentile (days) | ||
|---|---|---|---|---|---|---|
| Estimate | 95% CI | Estimate | 95% CI | |||
| This study | 2019-nCoV | Weibull | 6.4 | 5.6–7.7 | 10.3 | 8.6–14.1 |
| This study | 2019-nCoV | Gamma | 6.5 | 5.6–7.9 | 11.3 | 9.1–15.7 |
| This study | 2019-nCoV | Lognormal | 6.8 | 5.7–8.8 | 13.3 | 9.9–20.5 |
| Donnelly, 2003 [14,15] | SARS | Gamma | 3.8 | 3.0–4.9 | 9.45 | NA |
| Cowling, 2007 [16] | SARS | Lognormal | 5.1 | 4.6–5.5 | 12.9 | 11.7–14.5 |
| Lau, 2010 [17] | SARS (Hong Kong) | Lognormal | 4.4 | NA | 12.4 | NA |
| Lau, 2010 [17] | SARS (Beijing) | Lognormal | 5.7 | NA | 19.7 | NA |
| Lau, 2010 [17] | SARS (Taiwan) | Lognormal | 6.9 | NA | 17.9 | NA |
| Lessler, 2009 [18] | SARS | Lognormal | 4.8a | 3.6–4.4 | 10.6 | 8.9–12.2 |
| Assiri, 2013 [19] | MERS | Lognormal | 6.0b | 1.9–14.7 | 12.4 | 7.3–17.5 |
| Cauchemez, 2014 [20] | MERS | Lognormal | 5.5 | 3.6–10.2 | 10.2c | NA |
| Virlogeux, 2016 [21] | MERS (South Korea) | Gamma | 6.9 | 6.3–7.5 | 12.7 | 11.5–14.4 |
| Virlogeux, 2016 [21] | MERS (Saudi Arabia) | Lognormal | 5.0 | 4.0–6.6 | 11.4 | 8.5–17.5 |
CI: credible interval; NA: not available; 2019-nCoV: 2019 novel coronavirus; SARS; severe acute respiratory syndrome; SD: standard deviation; MERS: Middle East respiratory syndrome.
a Value calculated from median of 4.0 days provided in reference.
b Value calculated from median of 5.2 days provided in reference.
c Value calculated from mean and SD provided in reference.