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Table 2 Characteristics of the Mammography Evaluation Cohort from the Norwegian Women and Cancer Study by mammogram history, 2005-2010

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

  Program* Outside program Never
N 42285 6479 4599
Age in 2005 N = 42276 N = 6476 N = 4440
52-55 23∙8% 19∙9% 25∙9%
56-59 36∙0% 31∙4% 24∙6%
60-64 26∙1% 24∙2% 19∙3%
65-69 7∙2% 11∙2% 8∙5%
70-74 5∙0% 6∙9% 8∙1%
75-79 2∙0% 6∙4% 13∙7%
Parity N = 42285 N = 6479 N = 4599
none 7∙4% 7∙0% 8∙5%
1-2 52∙0% 52∙1% 43∙1%
3-4 36∙7% 36∙4% 40∙0%
5+ 4∙0% 4∙5% 8∙4%
Age at first birth N = 38904 N = 5983 N = 4170
<20 12∙0% 13∙3% 16∙4%
20-24 50∙6% 51∙1% 51∙6%
25-29 27∙9% 26∙9% 23∙3%
30-34 7∙1% 6∙4% 6∙3%
35+ 2∙4% 2∙3% 2∙5%
Body mass index N = 41054 N = 6288 N = 4369
<18.5 1∙1% 1∙0% 2∙2%
18.5-24,9 51∙4% 51∙4% 48∙8%
25-29,9 35∙2% 36∙5% 35∙1%
30+ 12∙2% 11∙1% 13∙8%
Education N = 40113 N = 6033 N = 4159
Primary (≤10) 38∙9% 41∙0% 51∙2%
Secondary (11–12) 29∙3% 29∙6% 23∙8%
College (≥13) 31∙8% 29∙4% 25∙0%
Maternal history of breast cancer 5% 8% 3%
Currently use hormone therapy 25% 32% 12%
  1. *Program = received at least one mammogram within the screening program.
  2. Outside program = received a mammogram, but only outside the screening program.
  3. Never = never had a mammogram.