What question did this study set out to answer?

The study aims to evaluate the relationship between hormonal contraception use and breast cancer risk in Costa Rican women.

A Case-Control Study of Breast Cancer and Hormonal Contraception in Costa Rica

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Case-control study investigates breast cancer risk related to hormonal contraceptives in women, highlighting implications for public health.

The study aims to evaluate the relationship between hormonal contraception use and breast cancer risk in Costa Rican women.
Conducted a case-control study involving 171 breast cancer cases and 826 controls.
Cases and controls were interviewed using a standard questionnaire on reproductive and contraceptive histories.
Logistic regression methods adjusted for confounding factors.
DMPA users showed a significant relative risk estimate of 2.6 for breast cancer compared to never users.
No dose-response relationship was found for DMPA users.
OC users had a relative risk estimate of 1.2, indicating no significant elevation in breast cancer risk.

Lee et al. (1987) studied this question.

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Case-control study investigates breast cancer risk related to hormonal contraceptives in women, highlighting implications for public health.