Children of married parents are better off, even after controlling for correlaries (see "Other Factors" in the chart), such as children being born prematurely, or parental income, race, age, and education.

https://ifstudies.org/blog/new-research-confirms-having-married-parents-helps-kids-get-ahead

https://ifstudies.org/blog/new-research-confirms-having-married-parents-helps-kids-get-ahead
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