Background Left unabated, rising temperatures pose an escalating threat to human health.
The potential effects of hot temperatures on fetal health have been under-explored. Here, we …

Abstract Background The United States (US) data suggest fewer‐than‐expected preterm
births in 2020, but no study has examined the impact of exposure to the early COVID‐19 …

Background The sex ratio at birth (male live births divided by total live births) may be a
sentinel health indicator. Stressful events reduce this ratio 3–5 months later by increasing …

Many of the studies on the sex ratio at birth (SRB) are based on a small number of cases
over a short period of time. Taking a multivariate approach to a dataset consisting of nearly …

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 …

Despite the occurrence of wildfires quadrupling over the past four decades, the health
effects associated with wildfire smoke exposures during pregnancy remains unknown …

Objectives A male is less adaptable to biological stressors than a female fetus with
consequent higher morbidity and mortality. Adverse birth outcomes increase and male …

Objectives The sex ratio of live births (males/total [M/T]) approximates 0.515. Many factors
reduce M/T, and these include stress. Antenatal sexing is used for female foeticide in the …

BACKGROUND Two seminal studies in the 1980s, by Preston and Coale (1982) and Arthur
and Vaupel (1984), generalized the Lotka equations developing the variable-r methods …

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 …