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.
全国青年纵向调查询问了母亲们许多问题，包括孩子的父亲是否与他们一起生活。
The NLSY surveys asked the mothers about many things, including whether the father of their children lived with them.
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