anchor: Whether this analysis estimated the C-R relationship between a pollutant and a given health endpoint using a single function from a single study or using multiple C-R functions from several studies, each C-R relationship was applied uniformly throughout the U.S. to generate health benefit estimates.
positive: There is a C-R relationship between a pollutant and a health endpoint.
negative: There is no C-R relationship between the pollutant and the endpoint.