受访者被问及他们在过去30天里服用了什么补品，他们还被要求将产品标签提交给全国卫生统计中心的营养学家。
Participants were asked what supplements they had taken in the past 30 days and submitted the product label to National Center for Health Statistics nutritionists.
由美国全国卫生统计中心收集的数据显示，2008年大部分美国男性的预期寿命为75.3岁，比2007年下滑了十分之一年。
Data gathered by the National Center for Health Statistics showed that life expectancy for most American men was 75.3 years in 2008, down by one-tenth of a year from 2007.
但根据国家卫生统计中心，最近的所能得到的全国数据，在2005年的结婚人只有225万。
But the total number of marriages in 2005, the most recent year for which complete national figures are available, is only 2.25 million, according to the national Center for Health Statistics.
但根据国家卫生统计中心，最近的所能得到的全国数据，在2005年的结婚人只有225万。
But the total number of marriages in 2005, the most recent year for which complete national figures are available, is only 2.25 million, according to the national Center for Health Statistics.
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