Table 3. Parameter estimates and credible intervals of generation and serial interval distributions of COVID-19 when allowing serial intervals to be negative and assuming an incubation period with a mean of 5.2 and a SD of 2.8 days, Singapore, 21 January–26 February 2020; Tianjin, China, 14 January–27 February 2020.

Dataset	Scenario	Interval	Estimate (95% credible interval) (days)
Dataset	Scenario	Interval	Mean	SD
Singapore^a	Allowing for all possible negative SI	GI	3.86 (2.22 - 5.60)	2.65 (0.87 - 5.43)
Singapore^a	Allowing for all possible negative SI	SI	3.86 (−5.15 - 13.88)	4.76 (4.05 - 6.72)
Tianjin (China)^b	Allowing for all possible negative SI	GI	2.90 (1.85 - 4.12)	2.86 (1.37 - 5.04)
Tianjin (China)^b	Allowing for all possible negative SI	SI	2.90 (−6.12 - 13.47)	4.88 (4.19 - 6.41)

COVID-19: coronavirus disease; GI: generation interval; SD: standard deviation; SI: serial interval.

^a Source: Ministry of Health (https://www.moh.gov.sg/news-highlights/, as at 26 February).

^b Source: Tianjin Municipal Health Commission (http://www.tjbd.gov.cn/zjbd/gsgg/, as at 27 February).