Fig. 2

The cost-effectiveness plane representing the incremental costs versus incremental QALYs for improving the ventilation rate of an exemplary 1000 ft² restaurant space to 12 ACH for: A the base-case scenario (mean year-round prevalence of 2% in the surrounding community where the restaurant is located and when 70% of the customers are vaccinated); B the best-case scenario (mean year-round prevalence of 0.1% in the surrounding community where the restaurant is located and when 90% of the restaurant customers are vaccinated); and (C) the worst-case scenario (mean year-round prevalence of 3% in the surrounding community where the restaurant is located and when no customer is vaccinated). The dots in the plot show the probabilistic runs of the Monte Carlo simulation with 5000 iterations. QALYs quality-adjusted life years; ACH air changes per hour