We test the selection hypothesis of infant mortality against the adaptation hypothesis by decomposing the mortality age pattern over the first year of life into an adaptation- and a selection component. We show that the population level decline in mortality over the first hour of life is significantly influenced by mortality selection, i.e.~the frailest infants leaving the population shortly after birth. The subsequent mortality decline predominantly results from mortality changes observed in homogeneous sub-populations. This confirms the common view of the infant mortality age pattern being caused by adaptation on an individual level. The analysis is informed by detailed micro-data on births and infant deaths in the United States including more than 25 million births and 162,546 deaths. No parametric assumptions were necessary.
|Publikationsdato||30. okt. 2017|
|Status||Udgivet - 30. okt. 2017|
|Begivenhed||International Population Conference 2017 - Cape Town International Convention Centre (CTICC), Cape Town, Sydafrika|
Varighed: 29. okt. 2017 → 4. nov. 2017
Konferencens nummer: 2017
|Konference||International Population Conference 2017|
|Lokation||Cape Town International Convention Centre (CTICC)|
|Periode||29/10/2017 → 04/11/2017|
Schöley, J., Oeppen, J., Lindahl-Jacobsen, R., & Vaupel, J. W. (2017). Selection and Adaptation Components of Infant Mortality. Abstract fra International Population Conference 2017, Cape Town, Sydafrika.