cohort mortality

例句：

1. 1.The study found that the cohort mortality rate was higher in urban areas than in rural areas.
   研究发现，城市地区的队列死亡率高于农村地区。
2. 2.The researchers analyzed the data to determine the cohort mortality rate for the population.
   研究人员分析了数据，以确定该人群的队列死亡率。
3. 3.The mortality rate of this cohort has been declining steadily over the past decade.
   这个队列的死亡率在过去十年里一直在稳步下降。