Appendix 1—table 3. Serial interval estimates: accounting for intermediates.

ordering	Number cases per cluster	$\mu$ (Tianjin)	$\sigma$ (Tianjin)	$\mu$ (Singapore)	$\sigma$ (Singapore)
Onset	3	4.17	0.998	4.03	1.06
Onset	4	4.31	0.935	4.17	1.06
Onset	5	4.43	0.999	4.43	1.09
Onset	6	4.54	1.05	4.76	1.15
Last Exposure	4	5.09	1.27	4.26	1.17
Bootstrap	4	4.49 (sd 0.716)	0.995 (sd 0.307)	3.83 (sd 0.882)	1.24 (sd 0.538)