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Incidence of invasive breast cancer for the age group 50-69 years in the AORH-counties in Norway. The first column shows the incidence rate in the period 1991-5; i.e. before women were invited to mammography screening. The second column shows the incidence rate for those not attending screening in the six first year of the screening program. The two columns to the right show incidence rates for those attending the second and third screening round (the incidence rate in the prevalence screening in 1996-97 is not shown). Ductal carcinoma in situ (DCIS) has not been included in the figure.

If we add the invasive cancer rate and the DCIS rate, then the combined incidence rate is 400; women who attend screening have doubled their risk to be diagnosed with breast cancer.