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Table 1 Age-specific breast cancer cases, person-years and rates for the Mammography Evaluation Cohort from the Norwegian Women and Cancer Study, 2005-2010

From: Overdiagnosis of breast cancer in the Norwegian Breast Cancer Screening Program estimated by the Norwegian Women and Cancer cohort study

   52-55 56-59 60-64 65-69 70-74 75-79
Total (N = 53363) Invasive 47 246 343 162 33 32
  Invasive + DCIS 53 267 400 181 35 36
  PY 22840 85593 114108 42796 20319 14360
  Rate 232 312 351 423 172 251
Program (N = 42285) Invasive 35 206 284 130 26 19
  Invasive + DCIS 38 225 334 147 28 21
  PY 17674 70331 94926 33452 15045 8569
  Rate 215 320 352 439 186 245
Outside program (N = 6479) Invasive 6 28 42 22 3 6
  Invasive + DCIS 8 30 49 24 3 8
  PY 2238 9244 12568 6069 3302 2724
  Rate 357 325 390 395 91 294
Never (N = 4599) Invasive 6 12 17 10 4 7
  Invasive + DCIS 7 12 17 10 4 7
  PY 2929 6017 6615 3274 1972 3067
  Rate 239 199 257 305 203 228
  1. DCIS = ductal carcinoma in situ.
  2. PY = person-years.
  3. Rates per 100,000 PY.
  4. Program = received at least one mammogram within the screening program.
  5. Outside program = received a mammogram, but only outside the screening program.
  6. Never = never had a mammogram.