Glossary

A man-made excavation or diked area for the retention of waste fluids.  (Source: West Virginia Department of Environmental Protection 2012)

A measure of the frequency with which new cases of illness, injury, or other health condition occurs among a population during a specified period. (Adapted from: Centers for Disease Control and Prevention 2014)

Earthquakes related to human activities. Events are typically small in magnitude and intensity of shaking. (Source: National Research Council 2013)

Systematic differences in the collection data regarding the participants in a study (e.g., about exposures in a case-control study or about health outcomes in a cohort study) that lead to an incorrect result or inference. (Adapted from: Centers for Disease Control and Prevention 2014)