The severity level of an average pollution-related case of CB (relative to that of the case described by Viscusi, et al.).
The severity levels go from 1 (the lowest) to 5 (the highest).
mnli hypothesis: The severity levels go from 1 (the lowest) to 5 (the highest). premise: The severity level of an average pollution-related case of CB (relative to that of the case described by Viscusi, et al.).