Variation in obstetric dimensions of the human bony pelvis in relation to age-at-death and latitude

American Journal of Physical Anthropology
Benjamin M AuerbachAdam D Sylvester

Abstract

Previous studies associate females who died in young adulthood with narrower obstetric pelvic dimensions, presumably in association with obstetric insufficiency (though this causal relationship is unresolved). In this study, we examine whether females within groups living at higher latitudes present this pattern, as high-latitude groups have larger pelvic dimensions than groups previously examined. These patterns are compared with males. We assess whether there is evidence for younger ages-at-death in females to have been in response to natural selection against narrower true pelvis dimensions. We measured 14 pelvic dimensions in 327 adults (188 females, 139 males), representing archaeological sites from mid-latitude and high-latitude North America. Individuals were placed into a "young" or "not young" age-at-death category. Latitude, sex, and age-at-death groups were compared using ANOVAs and scaled variance, and evidence for selection was examined with F-tests. Pelvic dimensions were larger in high-latitude females and males. Females but not males who died at younger ages had smaller pelvic canals than older individuals, especially in the mediolateral inlet and anteroposterior outlet dimensions. Variance in all pelvic dimensi...Continue Reading

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Citations

Jun 23, 2020·American Journal of Human Biology : the Official Journal of the Human Biology Council·Sarah J RicklanJay T Stock
Jun 11, 2020·American Journal of Physical Anthropology·Jeanelle UyCaroline VanSickle
Dec 10, 2020·American Journal of Physical Anthropology·Lukas WaltenbergerPhilipp Mitteroecker
May 21, 2021·Biological Reviews of the Cambridge Philosophical Society·Martin HaeuslerNicole M Webb
Oct 12, 2021·PloS One·Jeanelle Uy, Natalie M Laudicina
Oct 13, 2021·BMC Biology·Ekaterina StansfieldPhilipp Mitteroecker

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