This is a breakdown of effectiveness. The BMW I have selected for a test drive blows all four tires, stalls out and crashes on the dealer's special runway. I spend two days in the hospital. This is a breakdown in efficacy. This is a term for absolute risk .
External validity See applicability.
This may well constitute an exaggerated estimate of the reference test. On a graph of outcomes, this line divides results favoring therapy from results favoring the control. As in other matters, statistical tests do not guarantee clinical relevance. Homogeneity See heterogeneity. The rate at which an event occurs in a defined population over time.