I shouldn't be pedantic .... however
What you're actually measuring is your tolerance or threshold to cork taint (TCA). TCA is often present in miniscule quantities, such that we can't detect it.
Meanwhile some people are ultra sensitive to it, and others either can't spot it, or are quite tolerant.
Thus I believe people will be measuring the proportion of bottles that have a level of taint they can detect.
Sorry to be a pedant