system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The ratio between incidence among exposed and nonexposed persons is called-
assistant
The correct answer is  .relative risk also called as risk ratio ,is the ratio of the incidence of the disease or death among exposed and incidence among non exposed.it is a direst measure of strength of association between suspected cause and effect.RR of one indicates no association,it must also be noted that risk does not necessarily imply causal association ref:park&;s textbook,ed22,pg no 75