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Table 1 Detection rates, numbers and tumor stage of breast cancers among regular participants of the first three screenings of the mammography screening program in North Rhine-Westphalia, 2005–2013

From: Incidence of advanced-stage breast cancer in regular participants of a mammography screening program: a prospective register-based study

 

Initial

prevalence

screeningN0 = 1,200,246

1st subsequent incidence screeninga

N1 = 498,029

2nd subsequent incidence screeninga

N2 = 208,561

Breast cancer detection rate [DR] (per 100,000 screened)

831.4

537.7

518.4

Numbers of invasive cancers

8213

2233

941

Numbers of in-situ cancers

1766

538

207

Invasive cancers / Total cancers screen-detected (%)

82.3

80.6

81.9

Numbers of advanced stage cancers (UICC II+)

3205

762

323

Advanced stage cancers / Total cancers screen-detected (%)b

32.1

27.5

28.1

  1. aage - standardized to the distribution of the 5-years age groups in the initial screening
  2. bbased on computations that include imputed values (for missing data of size and nodal status) in both, nominator and denominator (see text)