As discussed above, based on recent preliminary findings from the Health Effects Institute, the magnitude of mortality from shorttern exposure (Alternative Estimate) and hospital/ER admissions estimates (both estimates) may be either under or overestimated by an uncertain amount.
The studies were not precise enough to deliver reliable information. 
mnli hypothesis: The studies were not precise enough to deliver reliable information.  premise: As discussed above, based on recent preliminary findings from the Health Effects Institute, the magnitude of mortality from shorttern exposure (Alternative Estimate) and hospital/ER admissions estimates (both estimates) may be either under or overestimated by an uncertain amount.