A time to be born: Variation in the hour of birth in a rural population of Northern Argentina

Chaney, Carlye; Goetz, Teddy G.; Valeggia, Claudia

doi:10.1002/ajpa.23483

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…In some cases, research published in 2018 supported findings previously only demonstrated in Western settings, providing additional evidence of universal traits. Births at a rural Argentinian hospital, in which medical interventions were minimal, were shown to peak in the early morning hours—similar to patterns seen historically in the United States—providing additional support for the hypothesis that early morning births were evolutionary favored (Chaney, Goetz, and Valeggia ). Consistent with existing experimental data from Western, educated, industrial, rich, and democratic (WEIRD) populations, field experiments carried out with sixteen globally dispersed subsistence‐scale populations provided further evidence that pride is a universal human attribute that functions to help motivate cooperative behavior (Sznycer et al.…”

Section: Contextual Variation In Biology and Behaviorsupporting

confidence: 58%

Biological Anthropology in 2018: Grounded in Theory, Questioning Contexts, Embracing Innovation

Martin

2019

American Anthropologist

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Biological anthropology in 2018 encapsulated what past scholars envisioned for its future: a multidisciplinary approach to understanding human and nonhuman primate evolution and diversity using the most innovative techniques and rigorous standards available. This year also built on a tradition of introspection about what biological anthropology encompasses and by whom and how it is conducted. This review highlights research and movements in the field that reflect both of these pursuits. Studies drew on evolutionary theory to generate novel insights into human and nonhuman primate biology, behavior, and organization. Studies on hominin evolution and human biology have upended previous understandings by revealing more dynamic and context-dependent processes in our ancestry and phenotypic expressions. Across subdisciplines, biological anthropologists have advanced the use of new technologies and analytical techniques and begun to promote open, transparent, and reproducible science among a more diverse community of researchers. [year in review, evolutionary anthropology, context and variation, emerging technologies, transparent methods, researcher diversity] RESUMEN La biología antropológica en 2018 encapsuló lo que investigadores anteriores imaginaron para su futuro:una aproximación multidisciplinaria para entender la evolución de primates humanos y no humanos y diversidad utilizando las técnicas más innovadoras y los estándares rigurosos disponibles. Este año también desarrolló sobre una tradición de introspección acerca de lo que la antropología biológica abarca y por quién y cómo es llevada a cabo. Esta revisión resalta la investigación y los movimientos en el campo que reflejan estas búsquedas. Los estudios se basaron en la teoría evolucionaria para generar nuevos conocimientos en la biología de primates humanos y no humanos, comportamiento y organización. Los estudios sobre la evolución de los homíninos y la biología humana han cambiado drásticamente entendimientos previos al revelar procesos más dinámicos y dependientes del contexto en nuestra ascendencia y expresiones fenotípicas. A través de las subdisciplinas, los antropólogos biológicos han avanzado el uso de nuevas tecnologías y técnicas analíticas y empezado a promover una ciencia abierta, transparente y reproducible entre una comunidad más diversa de investigadores. [año en revisión, antropología evolucionaria, contexto y variación, tecnologías emergentes, métodos transparentes, diversidad de investigadores] T he history of biological anthropology has been underscored by attempts to properly situate the field in relation to other natural sciences and the discipline of anthropology as a whole (e.g., Calcagno

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Section: Contextual Variation In Biology and Behaviorsupporting

confidence: 58%

Biological Anthropology in 2018: Grounded in Theory, Questioning Contexts, Embracing Innovation

Martin

2019

American Anthropologist

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“…Recently, MacFarlane and colleagues, based on data from England and Wales [ 7 , 21 ], found wide variations based on day of the week, birth setting, and medical interventions. Most prior studies have been based on data from single hospitals, regional collaborations, national hospitals or vital statistics data from a single country [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

The natural pattern of birth timing and gestational age in the U.S. compared to England, and the Netherlands

et al. 2023

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Objective To examine cross-national differences in gestational age over time in the U.S. and across three wealthy countries in 2020 as well as examine patterns of birth timing by hour of the day in home and spontaneous vaginal hospital births in the three countries. Methods We did a comparative cohort analysis with data on gestational age and the timing of birth from the United States, England and the Netherlands, comparing hospital and home births. For overall gestational age comparisons, we drew on national birth cohorts from the U.S. (1990, 2014 & 2020), the Netherlands (2014 & 2020) and England (2020). Birth timing data was drawn from national data from the U.S. (2014 & 2020), the Netherlands (2014) and from a large representative sample from England (2008–10). We compared timing of births by hour of the day in hospital and home births in all three countries. Results The U.S. overall mean gestational age distribution, based on last menstrual period, decreased by more than half a week between 1990 (39.1 weeks) and 2020 (38.5 weeks). The 2020 U.S. gestational age distribution (76% births prior to 40 weeks) was distinct from England (60%) and the Netherlands (56%). The gestational age distribution and timing of home births was comparable in the three countries. Home births peaked in early morning between 2:00 am and 5:00 am. In England and the Netherlands, hospital spontaneous vaginal births showed a generally similar timing pattern to home births. In the U.S., the pattern was reversed with a prolonged peak of spontaneous vaginal hospital births between 8:00 am to 5:00 pm. Conclusions The findings suggest organizational priorities can potentially disturb natural patterns of gestation and birth timing with a potential to improve U.S. perinatal outcomes with organizational models that more closely resemble those of England and the Netherlands.

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“…Similarly, time of day has been shown to influence birth events in other animals, such as Lipizzaner mares ( Equus ferus caballus ) on stud farms delivering over 90% of their foals between 18:00–06:00 h, and 63% between 21:00–03:00 h (Heidler et al, 2004), when human disturbance would be minimal. There is also an observed clustering of noninduced vaginal births of human infants between 01:00–07:00 h. This was deemed to be because of minimal disturbance and mother–infant bonding opportunities (Chaney et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Zoo‐housed mammals do not avoid giving birth on weekends

et al. 2020

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There is evidence that zoo visitor presence can influence the behaviour and, in some cases, adrenal response of zoo animals, and can sometimes compromise animal welfare. In some laboratory studies, significantly more primate births have been reported on weekends, when fewer people are working there, compared with weekdays when staffing levels are at their highest. Here, we investigate whether there is evidence of a “weekend effect” on births in zoo animals as a result of visitor numbers. Unlike laboratories, zoos are typically busier with visitors on weekends than on weekdays, although staffing levels remain fairly consistent across days of the week. If zoo animal parturition is sensitive to human presence, then fewer births would be expected on weekends compared with weekdays. We tested this using birth data and visitor numbers on the entrance gate from zoo records across 16 species representing artiodactyls, perissodactyls, carnivores and primates at four British zoos, to see whether there is an association between mean daily birth rates and average visitor numbers. We predict that, if there is a visitor effect, daily births should be lower on weekends than weekdays and should correlate with mean daily visitor numbers. Results showed that births for all 16 species were randomly distributed through the week, and there was no significant decline in births on weekends. We conclude that the “weekend effect”, if such a thing exists, does not appear to be a feature of zoo births, suggesting that elevated weekend visitor numbers are not sufficiently stressful to trigger delayed parturition.

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A time to be born: Variation in the hour of birth in a rural population of Northern Argentina

Cited by 5 publications

References 25 publications

Biological Anthropology in 2018: Grounded in Theory, Questioning Contexts, Embracing Innovation

Biological Anthropology in 2018: Grounded in Theory, Questioning Contexts, Embracing Innovation

The natural pattern of birth timing and gestational age in the U.S. compared to England, and the Netherlands

Zoo‐housed mammals do not avoid giving birth on weekends

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