Table 1.

Recent Estimates of Multiple-Partner Fertility, by Author(s) and Source

Authors	Data source(s); estimate year(s)	Overall prevalence	Prevalence among all parents	Prevalence among parents with at least 2 children
Author’s calculation	National Survey of Family Growth (men aged 15–44); 2006–10	13.1% of all men aged 40–44	17.1% of all fathers aged 40–44	22.5% of fathers aged 40–44
Dorius (2011)	National Longitudinal Survey of Youth 1979 (women aged 14–21 in 1979); 2006	18.7% of all women aged 41–49		27.7% of all mothers aged 41–49
Evenhouse and Reilly (2011)	Survey of Income and Program Participation (women aged 15 and older); 2008		7.5% of all mothers 15 and older who have biological children residing in the household
Author’s calculation	National Longitudinal Study of Adolescent Health (enrolled in grades 7–12 in 1995), wave IV; 2007–08	6.9% of all men aged 25–32 12.1% of all women aged 25–32	16.6% of fathers aged 25–32 22.1% of mothers aged 25–32	32.4% of fathers aged 25–32 37.9% of mothers aged 25–32
Scott et al. (2013)	National Longitudinal Survey of Youth 1997 (men aged 12–16 in 1997); 2008		13.7% of all fathers aged 23–27 47.6% of fathers aged 23–27 who were unmarried and non-resident at first birth
Fomby and Osborne (2013)	Fragile Families and Child Wellbeing Study (birth in a major city in 1998–2000); 2007–10 (9-yr follow up)		47.9% of mothers who had a birth in a major city in 1998–2000 57.3% of mothers who had a nonmarital birth in a major city in 1998–2000 18.6% of mothers who had a marital birth in a major city in 1998–2000
Cancian, Meyer, and Cook (2011)	Wisconsin child support enforcement data system and related administrative data as of June 2008		60% of firstborn children to unmarried mothers in 1997 have experienced parental MPF by age 10