Table 1 Estimates for the incubation periods of SARS, MERS, and COVID-19.

NA, not available.

Incubation
distribution
metric
SARSMERSCOVID-19
Mean (SD) or
mean (95% CI)
Hong Kong
(14): 4.4 (4.6)
Saudi Arabia
(15): 5.0
(4.0–6.6)
Wuhan (3): 5.2
(4.1–7.0)
Beijing (14): 5.7
(9.7)
South Korea
(15): 6.9 (6.3 to
7.5)
Mainland China
(4): 5.2
(1.8–12.4)
Taiwan (14): 6.9
(6.1)
South Korea
(16): 6.9 (6.3 to
7.5)
Mainland China
(6): 5.8 (4.6–7.9)
Hong Kong
(17): 4.6 (15.9)
Saudi Arabia
(16): 5.0 (4.4 to
6.6)
Global (7): 5.6
(5.0–6.3)
Mainland China
(20): 5.29
(12.33)
South Korea
(19): 6.7 (6.1 to
7.3)
Global (8): 5.5
Singapore (21):
4.83 (4.37–5.29)
Hong Kong
(21): 6.37
(5.29–7.75)
Median or
median (95% CI)
Hong Kong,
Canada, and
USA (22): 4
South Korea
(19): 6.0
(4.0–7.0)
Mainland China
(5): 3.0
Middle East
(23): 5.2
(1.9–14.7)
Global (8): 5.1
(4.5–5.8)
South Korea
(24): 6.3
(5.7–6.8)
PercentilesMainland
China, 90% (18):
10.7
NAMainland
China, 2.5% (6):
1.3
Hong Kong,
Canada, and
USA, 90% (22):
12
Wuhan, 95%
(3): 12.5
Singapore, 95%
(20): 9.66 (0.5)
Mainland
China, 97.5%
(6): 11.3
Mainland
China, 95% (18):
13.91
Global, 2.5% (8):
2.2 (1.8–2.9)
Hong Kong,
95% (21): 14.22
Global, 97.5%
(8): 11.5
(8.2–15.6)
Mainland
China, 99% (18):
20.08