Which one of the following is true regarding case fatality rate?
Case fatality rate = No. of deaths due to disease / No. of infected people Case fatality rate (CFR) is the ratio of deaths within a designated population of "cases" (people with a medical condition), over the course of the disease. A CFR is conventionally expressed as a percentage. CFRs are most often used for diseases with discrete, limited time courses, such as outbreaks of acute infections.
Numerator is always constant
Denominator is always constant
Numerator and denominator are propoions of each other
Numerator and denominator are two separate entities