All are true of attack rate except -
Ans. is 'a' i.e., It is a type of prevalence rate Attack rate is a type of incidence rate Attack rate It is an incidence rate. It is also known as cumulative incident rate. Usually expressed as a percentage. o Used only when the population is exposed to risk for a limited period of time such as during an epidemic.
It is type of prevalence rate
Expressed as percentage
Used when population is exposed to risk for a limited period of time
Reflects extent of epidemic