Many individuals in the United States do not know the appropriate age at which cancer screening examinations should be initiated, according to a survey conducted by the National Cancer Institute.
The 2005 Health Information National Trends Survey (http://cancercontrol.cancer.gov/hints), a telephone survey of the general population, revealed that 57% of US women are unaware that they should receive mammograms beginning at age 40 years to screen for breast cancer. Nonetheless, three quarters of women reported that their clinicians had recommended mammograms and 74% reported having received a mammogram within the recommended time frame.
Hampton T. Cancer Screening. JAMA. 2006;296(12):1458. doi:10.1001/jama.296.12.1458-b