The main approach to solve this problem is to stratify the population studied through taking the confounder as the stratifying variable.

解决这一问题的主要方法是将混杂因子作为分层变量把被研究群体分层。

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The Pediatric Outcomes Data Collection Instrument and the Gross Motor Function Measure were not sensitive to brace treatment in the population studied.

儿科成果数据采集仪器和大体运动功能测试量表在戴支架群体研究敏感性不高。

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Two study limitations include the use of self-reported food recall surveys and the fact that receptor data were only available for 65.4% of the population studied.

此项研究存在两个局限，包括受试者自身报告的食物摄入回忆调查准确性的保证及受体资料在调查人群中的不完全性(其中只有65.4%的人资料完备)。

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Mister Miller studied cities with a population of over two hundred fifty thousand.

VOA: special.2009.03.27

We could have gone on and studied the average at-risk population for decades and centuries.

我们本可以继续研究几百年来的,平均受危人群。

哈佛公开课 - 幸福课课程节选

How common is it in the general population, beyond the population of studied athletes?

FORBES: Is Football Giving Me Brain Damage? New Scan Opens Door to Self-Testing

Although the Tamiflu-resistant strain is still relatively rare, affecting about 2% of people with swine flu in the Australian population that they studied, Dr Hurt is concerned that it has the potential to turn global.

BBC: Drug-resistant pandemic swine flu 'community risk'

The Finnish researchers studied a population of people, called Sami, who lived in northern Scandinavia from the 17th to the 19th centuries.

BBC: The secret of a longer life?