在对美国全国青年纵向调查搜集的数据进行分析之后，研究者们得出了上述结论。
The researchers came to their conclusion after analysing data collected through the American National Longitudinal Survey of Youth.
研究数据来自于“国家青年纵向调查1979 (NLSY79)。”此项调查针对14至21岁的青年，这些青年第一次接受调查是在1979年。
Data for the study came from the national Longitudinal survey of Youth 1979 (NLSY79) — a national survey of people who were between 14 and 21 years old when they were first interviewed in 1979.
此研究的数据源自于参加了国家青少年健康纵向研究的15,000多名青年。
The study stemmed from data on more than 15,000 adolescents who participated in the National Longitudinal study of adolescent Health.
此研究的数据源自于参加了国家青少年健康纵向研究的15,000多名青年。
The study stemmed from data on more than 15,000 adolescents who participated in the National Longitudinal study of adolescent Health.
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