Table 1.

Relative effectiveness (%) of isolation policies in schools on the attack rate and outbreak duration compared to the baseline outbreaks without interventions. Median effect (interquartile range). For the policy and baseline scenarios, the effective attack rate and outbreak duration were calculated from the median of a set of 500 simulations for each policy option.

Outbreak	Policy option	Attack rate (% decrease)	Outbreak duration (% decrease)
Flu	One day isolation (CDC guideline)	29 (13 – 59)%	1 (−2 – 16)%
	Two day post-fever isolation	70 (55 – 85)%	18 (6 – 66)%
	Four day school week	73 (64 – 88)%	20 (11 – 55)%
	Three day school week	93 (91 – 97)%	99 (82 – 100)%
COVID-19	One day isolation	7 (5 – 14)%	1 (1 – 4)%
	Two day post-fever isolation	10 (5 – 17)%	1 (1 – 4)%
	14 day post-fever isolation	14 (5 – 26)%	4 (3 – 7)%
	Four day school week	57 (52 – 64)%	22 (12 – 26)%
	Three day school week	81 (79 – 83)%	46 (33 – 52)%