Twinning during the pandemic: Evidence of selection in utero

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Catalano, RalphSchool of Public Health, University of California, Berkeley, Berkeley, CA, USA (author)

Twinning during the pandemic : Evidence of selection in utero

Article/chapterEnglish2021

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2021-10-20
Oxford University Press,2021
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LIBRIS-ID:oai:DiVA.org:uu-463711
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-463711URI
https://doi.org/10.1093/emph/eoab033DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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Background and objectives: The suspicion that a population stressor as profound as the COVID-19 pandemic would increase preterm birth among cohorts in gestation at its outset has not been supported by data collected in 2020. An evolutionary perspective on this circumstance suggests that natural selection in utero, induced by the onset of the pandemic, caused pregnancies that would otherwise have produced a preterm birth to end early in gestation as spontaneous abortions. We test this possibility using the odds of a live-born twin among male births in Norway as an indicator of the depth of selection in birth cohorts.Methodology: We apply Box-Jenkins methods to 50 pre-pandemic months to estimate counterfactuals for the nine birth cohorts in gestation in March 2020 when the first deaths attributable to SARS-CoV-2 infection occurred in Norway. We use Alwan and Roberts outlier detection methods to discover any sequence of outlying values in the odds of a live-born twin among male births in exposed birth cohorts.Results: We find a downward level shift of 27% in the monthly odds of a twin among male births beginning in May and persisting through the remainder of 2020.Conclusions and implications: Consistent with evolutionary theory and selection in utero, birth cohorts exposed in utero to the onset of the COVID-19 pandemic yielded fewer male twins than expected.Lay Summary: Our finding of fewer than expected male twin births during the onset of the COVID-19 pandemic provides more evidence that evolution continues to affect the characteristics and health of contemporary populations.

Subject headings and genre

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Reproduktionsmedicin och gynekologi hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Obstetrics, Gynaecology and Reproductive Medicine hsv//eng
COVID-19
twins
selection in utero

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Bruckner, TimProgram in Public Health and Center for Population, Inequality and Policy, University of California, Irvine, Irvine, CA, USA (author)
Casey, Joan A.Environmental Health Sciences, Columbia University, New York, NY, USA (author)
Gemmill, AlisonJohns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA (author)
Margerison, ClaireDepartment of Epidemiology & Biostatistics, Michigan State University, East Lansing, MI, USA (author)
Hartig, Terry,1959-Uppsala universitet,Institutet för bostads- och urbanforskning (IBF)(Swepub:uu)terrhart (author)
School of Public Health, University of California, Berkeley, Berkeley, CA, USAProgram in Public Health and Center for Population, Inequality and Policy, University of California, Irvine, Irvine, CA, USA (creator_code:org_t)

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In:Evolution, Medicine, and Public Health: Oxford University Press9:1, s. 374-3822050-6201

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By the author/editor: Catalano, Ralph; Bruckner, Tim; Casey, Joan A.; Gemmill, Alison; Margerison, Clai ...; Hartig, Terry, 1 ...

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