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

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

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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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According to a 2010 study conducted by researchers at the University of Michigan, the ratio of positive to negative evaluations is twenty-five hundred to one.

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The study wasn't large enough or intended to establish when a ratio is "healthy" or when especially aggressive treatment is called for.

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Recently a detailed study conducted by the researchers at Columbia University has indicated that the cost-benefit ratio of using da Vinci surgical system to perform hysterectomies is not favorable at all.

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As for young American Jews, according to a study published in August 2010 by Brandeis University's Cohen Center for Modern Jewish Studies, the ratio of young American Jews who feel attached to Israel - while lower than that of older Jews -- has remained constant over the past twenty years.

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