定群研究是将特定的人群按其是否暴露于某因素或按不同暴露水平分为n个组群或队列，追踪观察一定时间，比较两组或各组的发病率或死亡率，以检验该因素与某疾病联系的假设。
定群研究
双语例句原声例句
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而采用RIA结果，该项定群研究获得了很明确的结论。
But, by using the results of RIA, our cohort study gave very definite conclusion.
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为了深入研究，研究者对1962年参加挪威母亲与子女定群研究项目的母亲和孩子进行研究。
To investigate further, the researchers studied data on 1962 mothers and their children who participated in the Norwegian mother and child Cohort Study.
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对泰安抽水蓄能电站地下洞群围岩稳定性进行了三维有限元数值模拟研究，结果表明：围岩最薄弱部位有时可能在距洞端一定距离上；
The numerical study shows that the weak position is not located at the middle of the powerhouse, but at the part with certain distance to one end of the power house.
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So when we talk about a cohort study, this means taking a group of people and following them over time.
所以当我们提到定群研究,就意味着,有一群人参加实验并需一直追踪下去
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A cohort study means you take the same group of people and follow them every five years for that period of time.
定群研究意味着你只有一组研究对象,然后在研究期间每五年进行一次记录数据
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