Sex differential patterns in perinatal deaths in Italy

Area of Science:

• Perinatal epidemiology
• Reproductive health
• Infant mortality studies

Background:

• Despite overall mortality decreases in industrialized nations, males exhibit higher early death rates.
• Understanding factors contributing to male infant vulnerability is crucial for improving survival.
• Perinatal mortality remains a significant concern, with sex-based differences requiring investigation.

Purpose of the Study:

• To investigate the association between infant sex and key survival factors.
• To explore the underlying causes of persistent male vulnerability in early life.
• To analyze sex-specific mortality patterns during the perinatal period.

Main Methods:

• Analysis of perinatal deaths, including stillbirths and neonatal deaths (first week of life).
• Examination of factors such as maternal age, education, birth order, and gestational age.
• Comparison of male excess in stillbirths versus neonatal deaths across different factor classes.

Main Results:

• A consistent higher male excess was observed in neonatal deaths compared to stillbirths.
• This pattern held true across all analyzed maternal and birth-related factors.
• Temporal sex ratio patterns in stillbirths and early deaths were identified.

Conclusions:

• The findings support a hypothesis of postponed male risk from the late fetal to the neonatal period.
• Male overmortality in early extrauterine life is a generalized phenomenon.
• Further research into sex-specific vulnerabilities during neonatal development is warranted.