The design consisted of face-to-face interviews of a nationally representative sample of more than 10,000 adolescents aged 13 to 18, with an average age of 15.
研究小组采取面对面访谈的方式，对全国1万余名年龄在13至18岁之间（平均年龄15岁）有代表性的青少年进行了抽样调查。
Researchers followed a sample of more than 2, 000 people, who were aged 65 or over when they took part in the General Household Survey in 1994.
研究人员对年龄在65岁或以上，参加了1994年综合住户统计调查的2000多人进行了跟踪考察。
The ordinal sample cluster method was used to study the distribution of blood pressure measurements by age for 2485 Mongolian children aged 4 to 14 in Zhemeng district.
本文用有序样品聚类方法对哲盟地区2485名4～14岁蒙古族儿童血压的年龄分期进行了聚类分析，以划分最优年龄段。
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