Appendix 1—table 4. Serial interval estimates: accounting for intermediates and using imputed dates of symptom onset.

ordering	Number cases per cluster	$\mu$ (Tianjin)	$\sigma$ (Tianjin)	$\mu$ (Singapore)	$\sigma$ (Singapore)
Onset	3	4.35	0.907	4.18	1.05
Onset	4	4.40	0.864	4.27	1.04
Onset	5	4.48	0.909	4.41	0.981
Onset	6	4.55	0.948	4.71	1.08
Last Exposure	4	4.81	0.948	4.62	2.11
Bootstrap	4	4.53 (sd 0.585)	0.941 (sd 0.358)	4.31 (sd 1.03)	1.50 (sd 0.629)