But several demographic studies have shown that even women just considered "overweight," with a body mass index of 25-30, may also be at increased risk of contraceptive failure.

然而一些人口研究的结果显示，那些身体质量指数超过25，不到30的女性也存在不断增加的避孕风险。

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Not everyone with high CO2 levels had a near-death experience, and previous studies have found that demographic and psychological factors are also involved.

不是所有血液中二氧化碳浓度高的人都会有这种经历，先前的研究发现人口学和心理学上的因素也起到了影响。

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Many studies abroad proved difficult as the demographic characteristics of the green consumer market segmentation variables.

国外许多研究证明人口统计特征难以作为绿色消费者的市场细分变量。

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"Spain is less attractive because there are no jobs, " Albert Esteve of the Barcelona Centre for Demographic Studies told Spain's National Radio.

BBC: Europe

Researchers from the Centre for Demographic Studies (Barcelona) and the Minnesota Population Centre have for the first time trawled through the censuses of more than 50 countries in every continent for people aged 25-39.

ECONOMIST: International marriage

So, digital studies started including demographic data.

FORBES: A Story About Occupying Digital Space. Or an Answer to 'How Should I Be Measuring Digital and Social Media Anyhow?'