Cohort Effects in Oral Contraceptive Use and Breast Cancer
Author Information
Author(s): M.G. Le, C. Hill, A. Kramar, L.H. Moulton
Primary Institution: Institut National de la Sante et de la Recherche Medicale (INSERM)
Hypothesis
Is there a cohort effect influencing the association between oral contraceptive use and breast cancer risk?
Conclusion
The study suggests that cohort effects may bias case-control studies linking early oral contraceptive use to breast cancer risk.
Supporting Evidence
- The study found that women born in the 1950s had higher rates of oral contraceptive use before age 25.
- Women born in the 1950s started using oral contraceptives at a younger age compared to those born earlier.
- The analysis suggests that cohort effects may bias the results of previous studies linking oral contraceptive use to breast cancer.
Takeaway
Women born in the 1950s used birth control pills earlier and more often than those born earlier, which might affect breast cancer studies.
Methodology
The study involved interviews with women aged 25 to 45 years in French hospitals and clinics.
Potential Biases
There is a risk of bias due to cohort effects and potential unaccounted confounding factors.
Limitations
The study does not account for all potential confounding factors associated with breast cancer risk.
Participant Demographics
Women aged 25 to 45 years with nonmalignant disease or no disease.
Statistical Information
P-Value
10^-4
Statistical Significance
p<0.05
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