Table 3.

Parameter values and descriptions

Parameter	Description	Units	Baseline	Range	Reference
N1	Population of age group 1 (0–17)	People	73,000,000	1–100 million	36
N2	Population of age group 2 (18–64)	People	191,000,000	1–250 million	36
N3	Population of age group 3 (65+)	People	38,000,000	1–50 million	36
${\mathfrak{R}}_{\mathit{unc}}^1$	Effective reproduction number (uncontrolled) for age group 1 (0–17)	1	1.3 & 1.35 & 1.4	0–2	35; 32; 40; 29
${\mathfrak{R}}_{\mathit{unc}}^2$	effective reproduction number (uncontrolled) for age group 2 (18–64)	1	1.25 & 1.3 & 1.35	0–2	35; 32; 40; 29
${\mathfrak{R}}_{\mathit{unc}}^3$	effective reproduction number (uncontrolled) for age group 3 (65+)	1	1.2 & 1.25 & 1.3	0–2	35; 32; 40; 29
${\mathfrak{R}}_{\mathit{unc}}^{\mathit{avg}}$	Average effective reproduction number (uncontrolled)	1	1.25 & 1.3 & 1.35	0–2	35; 32; 40; 29
βkj	Transmission rate from age group k to age group j	1	See Text	0–1	See Text
κkj	Average number of contacts age group k has with age group j	$\frac{\mathit{People}}{\mathit{Day}}$	See Text	0–40	16
ξk	Infectivity of age group k	1	See Text	0–1	See Text
ιj	Susceptibility of age group j	1	1	0–1	8; 39
ω	Incubation relative rate	Day−1	0.25	0–1	35; 10
δ	Non-hospitalized recovery relative rate	Day−1	0.20	0–1	10
ν1	Hospitalized recovery rate relative for age group 1 (0–17)	Day−1	$\frac{1}{5}$	0–1	27
ν2	Hospitalized recovery rate relative for age group 2 (18–64)	Day−1	$\frac{1}{8}$	0–1	27
ν3	Hospitalized recovery rate relative for age group 3 (65+)	Day−1	$\frac{1}{10}$	0–1	27
μ1	Death relative rate for age group 1 (0–17)	Day−1	0.0000192	0–1	11; 32
μ2	Death relative rate for age group 2 (18–64)	Day−1	0.0008224	0–1	11; 32
μ3	Death relative rate for age group 3 (65+)	Day−1	0.00008102	0–1	11; 32
χ1	Hospitalization relative rate for age group 1 (0–17)	Day−1	0.00435	0–1	11
χ2	Hospitalization relative rate for age group 2 (18–64)	Day−1	0.00457	0–1	11
χ3	Hospitalization relative rate for age group 3 (65+)	Day−1	0.0045	0–1	11
θ	Reduced contacts due to hospitalization	1	$\frac{1}{3}$	0–1	See Text
α	Reduced infectiousness due to incubation	1	0.5	0–1	See Text
ηi	Decrease in infectivity because of mask	1	0.20	0–1	24; 1
ηs	Decrease in susceptibility because of mask	1	0.50	0–1	24; 1
τ	Number of infectious individuals at which masks are implemented	People	30,200	30,200	See Text
ar	Positive constant that determines the rate of movement between mask and non-mask classes	1	0	0–1	See Text
br	Positive constant that determines the rate of movement between mask and non-mask classes	1	0.1	0–1	See Text
ϕr	Movement rate between mask and non-mask classes, r = S, SM, E, EM, I, IM	1	See Text	0–1	See Text, 13
I1/N1	Initially infected fraction of population of age group 1	1	$\frac{1,800}{73,000,000}$	0–1	15
I2/N2	Initially infected fraction of population of age group 2	1	$\frac{2,000}{191,000,000}$	0–1	15
I3/N3	Initially infected fraction of population of age group 3	1	$\frac{100}{38,000,000}$	0–1	15