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. Children who experienced parental remarriage were more likely than their peers to experience psychological distress.      

Analysis of 61 articles on the relationship between parental remarriage and the academic achievement and psychological well-being of children.
Source
“The Impact of Parental Remarriage on Children: A Meta-Analysis”
Jeynes, William H.
Marriage and Family Review Vol. 40, Number 4. , 2006. Page(s) 75-102.

. In this sample, married men earned $8,000 more, on average, than cohabiting men. Married households had $12,500 more in household income, on average, than cohabiting couples.                  

Data came from the National Longitudinal Survey of Youth, 1979 (NLSY, 1979) using the 1982 – 1994 waves. The analytical sample consisted of 385 cohabiting women, 404 cohabiting men, 942 married women, and 641 married men.
Source
“The Economic Consequences of the Dissolution of Cohabiting Unions.”
Avellar, S.
Smock, P. J.
The Journal of Marriage and Family Vol. 67, Number . , 2005. Page(s) 315 – 327.

Read more statistics under the section Marriage Research.