Appendix 1—table 1. Incubation period estimates (without intermediates) using gamma, Weibull and log normal distributions.

95% confidence intervals for the shape and scale (log mean and sd for log normal) parameters are shown in brackets.

Gamma	Median	Shape	Scale
Singapore Cluster	5.32	3.05 (2.0, 3.84)	1.95 (1.23, 2.34)
Tianjin Cluster	8.06	4.74 (3.35, 5.72)	1.83 (1.29, 2.04)
Weibull	Median	Shape	Scale
Singapore Cluster	5.66	1.83 (1.45, 2.30)	6.91 (5.77, 8.29)
Tianjin Cluster	8.59	2.41 (1.99, 2.90)	10.01 (8.94, 11.20)
Log normal	Median	Log mean	Standard deviation
Singapore Cluster	4.83	1.57 (1.38, 1.81) (mean 4.81)	0.60 (0.47, 0.76)
Tianjin Cluster	7.66	2.04 (1.92, 2.22) (mean 7.69)	0.47 (0.39, 0.56)