Table 1.

Summary of dispersion parameter k values from empirical offspring distribution.

Virus	Study design	Number of cases/location	Estimates of k (95% confidence interval)	Reference
SARS-CoV-2, 2019	Household and non-household	9120/mainland China	0.8 (0.63, 0.98)	He et al. (2020)
SARS-CoV-2, 2019	Household and non-household	1038/Hong Kong, China	0.45 (0.31, 0.76)	Adam et al. (2020)
SARS-CoV-2, 2019	Household and non-household	391/Shenzhen, China	0.58 (0.35, 1.18)	Bi et al. (2020)
A/H1N1, 1918	Household	7140/Baltimore, USA	0.94 (0.59, 1.72)	Fraser et al. (2011)
SARS-CoV, 2003	Household and non-household	238/Singapore	0.16 (0.11, 0.64)	Lloyd-Smith et al. (2014)