Changing ratio of breast cancer incidence rates with age of black females compared with white females in the United States.
Age-standardized breast cancer rates were approximately 30% lower in U.S. black women compared to white women. This observation concealed the fact that black women under age 40 years had a higher incidence of breast cancer than did white women, whereas white women over 40 years had a higher incidence. The known risk factors for breast cancer development (early age at menarche, late age at first full-term delivery, and a late age of menopause) differed in black and white populations, which might explain this difference in breast cancer incidence between blacks and whites at different ages.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D000367:Age Factors; D000368:Aged; D001943:Breast Neoplasms / Q000453:epidemiology*; D002648:Child; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008423:Maternal Age; D008593:Menopause; D008598:Menstruation; D008875:Middle Aged; D011247:Pregnancy; D012306:Risk; D014481:United States; D044465:White People