Advanced maternal age as a risk factor for cesarean delivery

Area of Science:

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

Background:

• Cesarean delivery rates have risen significantly in the US since the 1970s.
• Contributing factors include improved complication diagnosis, medicolegal concerns, and shifting maternal age demographics.
• The specific impact of advanced maternal age on cesarean rates requires further investigation.

Purpose of the Study:

• To determine if advanced maternal age (35 years and older) independently predicts primary cesarean delivery.
• To compare cesarean delivery risks between older mothers and younger controls.

Main Methods:

• Analysis of vital records for live singleton births in King County, Washington (1986-1987).
• Inclusion of women aged 35+ (N=2985) and a comparison group aged 20-29 (N=6140).
• Risk assessment for cesarean delivery based on maternal age, parity, and recorded complications.

Main Results:

• Women aged 35 and older had a 1.6 times higher risk of cesarean delivery compared to younger women.
• Primiparous women of all ages had higher complication and cesarean rates.
• Among first-time mothers with no recorded complications, older women faced a 2.5 times increased risk of cesarean birth.

Conclusions:

• Advanced maternal age appears to be an independent risk factor for cesarean delivery.
• Physician decision-making regarding delivery method may contribute to higher cesarean rates in older mothers.
• This suggests potential for unnecessary cesarean births in this demographic, warranting further clinical review.