Setting and age of first case	Total number of events	Additional cases identified		Proportion resulting in an outbreak (95% CI)	P
		No	Yes
Childcare					0.005
Child 0–5 years	54	47	7	13.0% (5.4–24.9%)
Adult ≥ 19 years	52	33	19	36.5% (23.6–51.0%)
School					0.716
Child 6–12 years	55	38	17	30.9% (19.1–44.8%)
Adolescent 13–15 years	22	13	9	40.9% (20.7–63.6%)
Adolescent 16–18 years	75	45	30	40.0% (28.9–52.0%)
Adult ≥ 19 years	65	40	25	38.5% (26.7–51.4%)

P values are for χ² test. Data are sourced from the report into coronavirus disease 2019 (COVID‐19) in Victorian childcare centres and schools. ¹⁶ Confidence intervals (CIs) and P values were calculated by the author. Testing was initially restricted to symptomatic persons. In addition, some close contacts may not have been tested. As such, transmission may be underestimated. ¹⁶