Delayed childbearing and pregnancy outcome

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Reproductive Health

Background:

• Delayed childbearing, defined as pregnancy at advanced maternal age (AMA), is increasingly common.
• Understanding the impact of AMA on pregnancy outcomes is crucial for prenatal care and risk assessment.

Purpose of the Study:

• To analyze the effect of delayed childbearing on pregnancy outcomes among nulliparous women.
• To compare complication rates and neonatal outcomes between older (>=35 years) and younger (20-29 years) nulliparous women.

Main Methods:

• A hospital-based prospective study of 17,230 nulliparous women delivering singleton gestations between 1987 and 1992.
• Assessment of outcomes including low birth weight, preterm delivery, small for gestational age, perinatal death, and various pregnancy/delivery complications.
• Statistical comparison of outcomes between women aged >=35 years and those aged 20-29 years using odds ratios (OR).

Main Results:

• Women aged >=35 years showed no significantly higher odds of low birth weight (OR=1.3), preterm delivery (OR=1.2), small for gestational age (OR=1.0), or perinatal death (OR=1.7).
• Significantly higher rates were observed for antepartal complications (OR=1.9), cesarean section (OR=2.5), and breech presentation (OR=1.4).
• Neonatal intensive care unit admission rates were higher (OR=1.4), but not significantly so when excluding preterm infants.

Conclusions:

• Delayed childbearing is associated with increased risks for specific pregnancy and delivery complications in nulliparous women.
• Despite higher complication rates, neonatal outcomes were not appreciably different compared to infants of younger women.
• Advanced maternal age warrants careful monitoring for obstetric complications during pregnancy and delivery.