Another influence comes from the mandates of the organizations that report statistical data.
Some organizations--such as CDC´s National Center for Health Statistics--were created to report on health conditions or care
Others collect health statistics as a part of a program to improve health--for example, the Substance Abuse and Mental Health Services Administration works to improve mental health and reduce drug abuse and also reports statistical indicators.
Still others such as the US Census Bureau--collect health statistics along with a range of statistical indicators.
These different mandates shape the kind of statistical information reported, the methods used to collect data and the way data are reported.