The increase in risks for complications during pregnancy at age 35 compared to younger ages can vary significantly depending on the specific condition. Here’s a breakdown of the order of magnitude of some common risks:
1. Chromosomal Abnormalities (e.g., Down Syndrome):
At age 25: About 1 in 1,200 (0.08%).
At age 35: About 1 in 350 (0.29%).
Increase in risk: Approximately 3-4 times higher.
2. Gestational Diabetes:
At age 20-29: About 2-3% of pregnancies.
At age 35-39: About 6-8% of pregnancies.
Increase in risk: Approximately 2-3 times higher.
3. Preeclampsia (High Blood Pressure in Pregnancy):
At age <35: About 2-5% of pregnancies.
At age ≥35: About 8-10% of pregnancies.
Increase in risk: 1.5-2 times higher.
4. Miscarriage:
At age 20-29: About 10-15%.
At age 35: About 20-25%.
Increase in risk: ~1.5-2 times higher.
5. Stillbirth:
At age 20-29: 4 in 1,000 (0.4%).
At age 35: 6-8 in 1,000 (0.6-0.8%).
Increase in risk: ~1.5-2 times higher.
Summary: The increases are generally not an order of magnitude (10x), but risks often double or triple by age 35. These percentages highlight the importance of regular prenatal care and monitoring for women of advanced maternal age.