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Reproductive history and breast cancer in a population of high fertility, Costa Rica, 1984-85
The relationship between breast cancer and women's reproductive history in Costa Rica was analyzed using logistic regression methods on data from 171 breast cancer cases and 826 population-based controls aged 25–58 years. ...
The effect of using different reference dates for control exposure measurement on relative risk estimates in a case-control study
In case-control studies in which case and control enrollment periods are not identical, exposure status for time-dependent variables is often measured relative to a reference date. Using data from a case-control study of ...
A case-control study of breast cancer and hormonal contraception in Costa Rica
By 1981, 11% of married women in Costa Rica ages 20-49 years had used depot-medroxyprogesterone acetate (DMPA) and 58% had used oral contraceptives (OCs). Since 1977, the Costa Rican Ministry of Health has maintained a ...
Oral Contraceptives and Cervical Cancer Risk in Costa Rica: Detection Bias or Causal Association
To examine the relationship between cervical cancer and oral contraceptive (OC) use, we analyzed data from a population-based, case-control study in Costa Rica. Women aged 25 to 58 years in whom cervical cancer was ...