Table 2. Assumed and literature derived parameters.

Parameter	Symbol	Value	Source
Incubatory infectiousness, relative to acute illness	rI	0.5	Assumption [36,37]
Subclinical infectiousness, relative to acute clinical illness	rS	1	Assumption
Incubation duration (days)*	PD	Low: Lognormal (2.235, 0.496)	[38]
		High: Lognormal (1.548, 0.344)
Duration of infectiousness (weeks)*	ID	Under 30 years: Lognormal (1.172, 0.483)	[39]
		30 years old +: Lognormal (1.258, 0.788)
Probability of gallstones by age bin (male, female)	pG	10–19 (0, 0.097)	[15,16]
		20–29 (0.045, 0.234)
		30–39 (0.134, 0.431)
		40–49 (0.167, 0.517)
		50–59 (0.198, 0.60)
		60–69 (0.247, 0.692)
		70–79 (0.435, 0.692)
		80+ (0.40, 0.555)
Long-cycle environmental vehicle decay rate	LD	0.24/day	[32]
Dose response†		beta-Poisson(1.75E-01,1.11E+06)	[40]
Long-cycle exposure multiplier, 1992–2000	mEL_D	0	Assumption

Parameters marked with * are lognormal distributions Lognormal(μ,σ), where μ and σ are the fitted mean and standard deviation values of the underlying normal distribution, respectively. Parameter marked with † is a beta-Poisson model parameterized beta-Poisson(α, N₅₀), where α and N₅₀ are derived from published sources [40].