课外活动反映了皮尤研究中心育儿方式的差异，这是从对全国1807名家长的代表性抽样调查的结果。
Extracurricular activities reflect the differences in child-rearing in the Pew survey, which was of a nationally representative sample of 1,807 parents.
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。
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.
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