BACKGROUND The long-term decline in cohort fertility in highly developed countries has
been widely documented. However, no systematic analysis has investigated which parity …

After decades of fertility postponement, we investigate recent changes in late parenthood
across low‐fertility countries in the light of observations from the past. We use long series of …

The twinning rate has increased dramatically over the last four decades in developed
countries. Two main factors account for this increase: delayed childbearing, as older women …

The ongoing period fertility decline in the Nordic countries is particularly strong in Finland,
where the total fertility rate (TFR) reached an all-time low of 1.41 in 2018. We analyse the …

HOW FAR CAN THE shift to later childbearing in developed countries be accounted for by
the growth in educational participation? A move to later childbearing has been a …

At the individual level, a very strong negative relationship is observed between age at first
birth and total number of children. However, at the country level, it is possible that no …

Obtaining cross-country comparative perspectives on male fertility has long been difficult, as
male fertility is usually less well registered than female fertility. Recent methodological …

We introduce a simple and interpretable model for functional data analysis for situations
where the observations at each location are functional rather than scalar. This new …

Abstract Advanced maternal age (AMA,> 35 years at delivery) confers maternal and foetal
risks, particularly with age> 45 years and nulliparity, but longitudinal comparative data on …

The demographic balance equation relates the population growth rate with crude rates of
fertility, mortality, and net migration. All these rates refer to changes occurring between two …