The reason why we need positive psychology is to shift the pendulum from the 21:1 ratio that we have today: for every one study on depression or anxiety, we have 21 studies on-- sorry, for one study on happiness or wellbeing, we have 21 studies on depression and anxiety.

我们需要积极心理学是为了改变,现在的21比1这个比率：,每有一项关于抑郁或焦虑的研究，就有21项，对不起，应该是每有一项关于快乐或幸福的研究，就有21项关于抑郁或焦虑的研究。

哈佛公开课 - 幸福课课程节选

These others were chosen to match the study group's age profile, sex ratio and dwelling place.

ECONOMIST: Confirmation that dental X-rays can be bad for you

The ratio using these numbers is higher than that found in the study.

WSJ: Heart-Attack Risk Starts Younger

In one study, experimenters measured the facial width-to-height ratio of 192 Masters of Business Administration students, 115 of whom were men.

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