Maternal caffeine consumption and spontaneous abortion: a prospective cohort study

Area of Science:

• Obstetrics and Gynecology
• Perinatal Epidemiology
• Reproductive Health

Background:

• Caffeine is a widely consumed stimulant with potential effects on pregnancy.
• Previous research has yielded conflicting results regarding caffeine consumption and spontaneous abortion risk.

Purpose of the Study:

• To investigate the association between caffeine beverage consumption and spontaneous abortion.
• To evaluate the impact of coffee, tea, and soda intake in early pregnancy.

Main Methods:

• A cohort study of 2,967 pregnant women at Yale-New Haven Hospital (1988-1992).
• Interviews conducted before 16 weeks of gestation to assess beverage intake in the first month of pregnancy.
• Statistical analysis using adjusted odds ratios to determine risk associated with caffeine consumption levels.

Main Results:

• Consumption of >300 mg of caffeine daily was associated with an increased odds ratio for spontaneous abortion (1.75).
• Drinking 3 or more cups of tea or coffee daily showed elevated risks (OR=2.33 for tea, OR=2.63 for coffee).
• Caffeine consumption showed a stronger relation to spontaneous abortion than alcohol or cigarette use in early pregnancy.

Conclusions:

• Findings suggest a potential link between high caffeine intake, particularly from tea and coffee, and spontaneous abortion.
• The results indicate that an ingredient or correlate in tea or coffee, rather than caffeine alone, might contribute to the observed association.
• Further research is warranted to validate these findings and elucidate the specific mechanisms involved.