Cohort Fertility and Couple Educational Pairing

Educational disparities in cohort fertility rates (CFR) often serve as the starting point for analyzing socioeconomic drivers of fertility. As most children are born to couples, the relationship between education and fertility is the compound of both partners’ education. Measuring both partners' educational levels is generally considered superior to measuring one partner’s educational level. Yet, no study has comprehensively analyzed cohort fertility by couple’s educational pairing. Using Finnish register data, we provide the first analysis of CRFs from the perspective of educational pairings. For the female birth cohorts of 1969 -1975, we decompose the CFR from births by the educational pairing of the union in which they occur. This novel measure complements previous work focusing on the incidence or instantaneous birth risks by educational pairing, as it draws on lifetime exposure to unions by educational pairings and birth rate within such unions. Our analysis reveals that the CRF in Finland— for the most recent cohorts from which such measures can be derived— is predominantly the result of births in educationally hypogamous or homogamous unions, and unions where at least one partner has tertiary education. In particular, the CFR of highly educated women is composed of births to highly educated partners.