他们从一个含有1971年至1975年的参与者的全国健康调查(即NHANES I，第一次全国健康和营养检查调查)和几年后随访调查中找寻数据。
They did this by examining data from a national health survey that examined participants between 1971 and 1975, known as NHANES I, and from a follow-up survey years later.
他们从一个含有1971年至1975年的参与者的全国健康调查(即NHANES I，第一次全国健康和营养检查调查)和几年后随访调查中找寻数据。
They did this by examining data from a national health survey that examined participants between 1971 and 1975, known as NHANES I, and from a follow-up survey years later.
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