Breastfeeding and breast cancer: a case-control study in Southern Brazil.

@article{Tessaro2003BreastfeedingAB,
  title={Breastfeeding and breast cancer: a case-control study in Southern Brazil.},
  author={S{\'e}rgio Tessaro and Jorge Umberto B{\'e}ria and Elaine Tomasi and Cesar Gomes Victora},
  journal={Cadernos de saude publica},
  year={2003},
  volume={19 6},
  pages={
          1593-601
        }
}
To investigate the relationship between breastfeeding and breast cancer in Southern Brazil, a case-control design was employed, with two age-matched control groups. A total of 250 cases of breast cancer were identified in women from 20 to 60 years of age, with 1,020 hospital and community controls. The main study variables were occurrence of breastfeeding and duration of breastfeeding. A multivariate conditional logistic regression analysis was employed. According to the results, breastfeeding… 

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