Women who were the second or subsequent child born in their
families had a significantly reduced risk of breast cancer when
compared to those first born. There was also very strong and
significant relation between non-insulin dependant diabetes
(NIDDM) and breast cancer (OR¼ 8.4, 95% CI 1.7–41) although this
was based on a very small number of affected case women (n¼ 3).
No other reported diseases showed any association, nor was there
one between our measure of family history of cancer and breast
cancer.