How well they measure what they are trying to measure), but also on (1) the extent to which the risks being valued are similar, and (2) the extent to which the subjects in the studies are similar to the population affected by changes in pollution concentrations.
How much the study participants are like the people impacted by variance in amount of pollution.
This study is about a new heart disease medication.
A kid is rolling on the ground after getting hit in the groin.
I believe that George W. will not be running for office.
The woman and man are outside.
Don't use crickets when you go fishing.
Arabs tend to avoid buying Russian because of its inferior quality.
People waiting at a crosswalk.