発はっ生せい率りつ

noun

incidence rate; frequency of occurrence

Used in statistics, medicine, and technical contexts to describe how often something happens within a population or over time.

• この病びょう気きの発はっ生せい率りつは年ねん々ねん低てい下かしている。

  The incidence rate of this disease is decreasing year by year.

• 交こう通つう事じ故この発はっ生せい率りつを減へらすための対たい策さくが取とられた。

  Measures were taken to reduce the frequency of traffic accidents.