The researchers found that each unit increase in body mass index (BMI) was associated with a 6 percent lowered risk for normal-tension glaucoma.

研究者们发现，体重指数（BMI）每增加一个单位，患正常眼压型青光眼的风险就降低6%。

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Canopy is measured according to leaf-area-index (LAI) relative to wall area; for each unit of LAI, sunlight decreases by about half.

雨棚是根据相对于墙体面积的叶面积指数(LAI)来测量的；每单位LAI，日照减少约一半。

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The methodology for the "global peace index" was devised by the Economist Intelligence Unit, our sister company.

“全球和平指数”的方法学由本刊姊妹公司“经济学人信息社(Economist Intelligence Unit)”设计发明。

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The study, remember, argues that a doubling of the relative wages of civil servants is needed to reduce a country's score on the corruption index by a single unit.

ECONOMIST: Reasons to be venal

The relationship is strong enough, Ms Van Rijckeghem and Ms Weder reckon, to suggest that raising average civil-service pay from 100% to 200% of the manufacturing wage reduces corruption by about one unit in the corruption index.

ECONOMIST: Reasons to be venal | The

Lower unit labor costs are confirmed by the employment cost index.

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