The prevalence survey of hyperlipidemia and its case control study on risk factors were carried out in 903 middle or old person.

对903名中老年人群进行高脂血症的现况调查和危险因素的病例对照研究。

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By contrast, Norway had the lowest prevalence of obesity in a single survey at just five per cent.

与之相反的是，挪威是单项调查中发胖几率最少的国家，仅为百分之五。

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The survey also found rural residents suffer a higher prevalence of mental disorders than urban residents.

调查中还发现，精神紊乱的发病率在农村要比在城市更高。

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The Gambling Prevalence Survey, released on September 19th, surprised many with its findings, though some contest the figures.

ECONOMIST: Gambling addicts

Around one in three males and one in five females reported lifetime use of any illegal drug, according to the Drug Prevalence Survey.

BBC: More than 25% people have taken drugs

According to the 2010 British Gambling Prevalence Survey, most problem gamblers are men, but a growing number of women are also gambling more than they can afford.

BBC: Gambling addict tells of fight to save family life