Anti-immigrant stigma or xenophobia is increasingly pervasive globally. Racism is a
determinant of adverse health outcomes, but the epidemiological implications of the recent …

Objectives We aim to contribute to the literature reporting tests of selection in utero. The
theory of reproductive suppression predicts that natural selection would conserve …

Emerging theory and empirical work suggest that the 'Bruce Effect', or the increase in
spontaneous abortion observed in non-human species when environments become …

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 …

Prior research based on Swedish data suggests that collective optimism, as measured by
monthly incidence of suicides, correlates inversely with selection in utero against male twins …

Scholarly literature claims that health declines in populations when optimism about investing
in the future wanes. This claim leads us to describe collective optimism as a predictor of …

Periviable infants (ie, those born in the 20th through 26th weeks of gestation) suffer much
morbidity and approximately half die in the first year of life. Attempts to explain and predict …

Fertility decline remains a key concern among high-income countries. Prior research
indicates that income supplementation through unconditional cash transfers (UCT) may …

Background: The literature theorizes, but does not test, that variation over time in selective
loss in utero affects the observed count of live-born birth defects cases. We test the …

Background: Cancer ranks as the second leading cause of death among children ages 1 to
14 years in the United States. Previous research finds that strong cohort selection in utero …