Table 1.

Model parameters

	Mean	Distribution	Parameter	References
Demographic data
Population by age				15
1--5 years old	6.63%
6—12 years old	7.17%
13—19 years old	6.86%
20—39 years old	36.65%
40—64 years old	30.46%
65+ years old	12.24%
Percentage of adult population affected by school closure:				15
kindergarten (1-5 years old)	4.54%
kindergarten/primary school (1-11 years old)	10%
Disease parameters
Basic reproductive number (R0)	1.5, 2.0, 2.5			31; 32; 8
Mean duration of exposed period	1.9 days			17; 18
Mean duration of infectious period	7 days (<12 years) 5 days (12+ years)			17; 18; 19
Proportion asymptomatic (p)	33%
Infectivity (last exposed stage)	50%			19
Infectivity (in the five infectious stages)	100%, 100%, 50%, 30%, 15%			19;20
Mixing assumptions
Scenario A (baseline)
Reduction in contact rate between dismissed   children of same/other age groups	90%/25%
Reduction in contact rate among care-taking   parents and same age group	0%
Scenario B
Reduction in contact rate between dismissed   children of same/other age groups	90%/25%
Reduction in contact rate among care-taking   parents and same age group	50%
Scenario C
Reduction in contact rate between dismissed   children of same/other age groups	50%/10%
Reduction in contact rate among care-taking   parents and same age group	0%
Disease outcomes
Outcomes per 1000 cases by age groupsa				25
Outpatient	(534, 389, 497)	Uniform	((494-574), (369-410), (487-506))
Inpatient	(4, 8, 29)		((1-8), (2-13), (21-37))
Death	(1, 2, 13)		((0-2),(0-4),(11-15))
Economic parameters
Cost of energy saving (1000 US$)	1 439	Gammab	α=16; β=90	Oslo Municipality
Cost of lost learning (1000 US$)	25 797	Gamma	α=16; β=1 612	Bjørknes private school
Proportion of productivity loss catching up	15%	Uniform	range [0: 30%]
Average cost per self-care person (US$)	43	Normal	σ=3.57	26
Average cost per out-patient (US$)	59	Normal	σ=4.92	Den norske legeforening
Average cost per in-patient (US$)	5 211	Normal	σ=434	26
Average wage per day (US$)	290	Normal	σ=24	15

^aAge groups were grouped by 1—18 years old, 19—64 years old and 65+years old.

^b$f\left(x;k,\theta \right)=x^{k-1}\frac{e^{-x/\theta }}{{\theta }^k\Gamma \left(k\right)}$ where Γ is the Gamma function.