One of the initial things that Keyes found is that there was as much as a ten-fold difference in rates of coronary disease.

凯斯首先发现的其中一项结果是,七个国家的冠心病发病率

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

It dropped dramatically in the period from 1954-- this is these filled black bars refer to this axis, polio cases per 100,000 population dropped down to only three or four cases by 1956.

患病率在一九五四年后的,一段时间里急剧下降,该坐标轴上的这些黑色柱形图表明,到一九五六年,小儿麻痹症的发病率,已经降低至每十万人中仅三到四人发病

耶鲁公开课 - 生物医学工程探索课程节选

So more than doubling the risk can certainly site to the population Now these kind of results show how important it is to do studies that don't group everybody in the population together.

由图可见,发病率差异量超过一倍,这些研究结果表明,在研究过程中分组的重要性

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

It's a devastating, frequently fatal infectious disease.

它是一种毁灭性的,频繁发病的致命疾病

耶鲁公开课 - 生物医学工程探索课程节选