What is a technical term (perhaps from statistics) for the extent (or proportion) that a specified condition applies to some given population?
There is a communicable cancer currently ravaging the Tasmanian Devil species. I would use this term to say “the [extent/proportion in the population] of the cancer”.
Software test suites exercise some amount of the application code, by some metric such as code paths exercised by the tests. I would use this term to say “the [extent/proportion of application tested] of the test suite”.
Note that this is a descriptor for the condition, not the population. (As requested on a comment at a similar question, I am making a new question to be clearer.)
Also note this is not a term that applies specially to human populations, but rather to any population of things, living or inert, that could be affected by the condition.
What term, applied to the condition, connotes this meaning of penetration and/or extent?