Early age at first birth and decreased risk of breast cancer.

  title={Early age at first birth and decreased risk of breast cancer.},
  author={Christopher J. Bain and Walter C Willett and Bernard Rosner and Frank E. Speizer and Caroline B{\'e}langer and Charles H. Hennekens},
  journal={American journal of epidemiology},
  volume={114 5},
The relationship between age at birth of a first child and breast cancer was evaluated for 1159 affected women and 11,590 women without cancer in data collected in 1976 among married female registered nurses residing in 11 states in the United States. A positive trend of increasing risk of breast cancer with later ages at first birth was found (chi 2(1) for trend in proportions = 30.9, p less than 0.01). Adjustment for potential confounding variables by multiple logistic regression did not… CONTINUE READING