Although 1 per 30 and 1 per 35 weeks have the widest acceptable range of R₀, the method of Table 1 does not account for how central the true values are to the simulated CIs. To address this, we determined which combination of λ and R₀ produced the smallest CIs in increments of 1%. We found that λ = 1 per 40 weeks with R₀ = 300 resulted in the shortest CIs covering the values of 4 criterion values from the data (Figure 3; and “Determining acceptable values of λ and R₀”), and thus consider these to be the best estimates.