Table 1.

Estimated Incubation Period for COVID-19 Cases Using Different Parametric Models

Distribution	Log-Likelihood*	Parameter 1	Parameter 2	Mean	5th Percentile	50th Percentile	95th Percentile	99th Percentile
Weibull	−449.5	1.6 (1.4–1.9)	7.3 (6.6–7.9)	6.5 (5.9–7.1)	1.2 (0.9–1.5)	5.8 (5.2–6.4)	14.3 (13.0–15.7)	18.7 (16.7–20.9)
gamma	−452.7	2.1 (1.5–3.0)	3.0 (2.2–4.2)	6.5 (5.9–7.1)	1.3 (0.7–1.8)	5.5 (4.8–6.2)	15.1 (13.4–16.9)	21.0 (18.1–24.1)
Log-normal	−479.3	1.6 (1.5–1.8)	0.9 (0.6–1.2)	7.2 (6.2–8.9)	1.2 (0.6–2.1)	5.0 (4.3–5.9)	20.5 (14.7–29.5)	36.6 (22.2–58.8)

Note: *Larger value of log-likelihood indicates a better fit.