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Table 3 Age-adjusted relative risk (RR) of breast cancer: estimates and 95% confidence intervals

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

Invasive and DCIS Never/outside program Never Outside program
Age adjusted * 0∙93 (0∙79, 1∙10) 0∙77 (0∙59, 1∙01) 1∙04 (0∙86, 1∙26)
Additionally adjusted for:    
Parity 0∙94 (0∙80, 1∙10) 0∙78 (0∙59, 1∙02) 1∙04 (0∙86, 1∙26)
Hormone therapy use 0∙93 (0∙79, 1∙10) 0∙81 (0∙62, 1∙06) 1∙01 (0∙83, 1∙22)
Maternal history of cancer 0∙93 (0∙79, 1∙09) 0∙78 (0∙59, 1∙01) 1∙02 (0∙84, 1∙24)
Body mass index (<25, 25+) 0∙95 (0∙80, 1∙12) 0∙77 (0∙58, 1∙01) 1∙06 (0∙87, 1∙28)
Education (primary, secondary, college) 0∙96 (0∙81, 1∙14) 0∙77 (0∙58, 1∙03) 1∙07 (0∙88, 1∙30)
Full model 0∙97 (0∙82, 1∙15) 0∙82 (0∙61, 1∙11) 1∙05 (0∙86, 1∙28)
Invasive only Never/outside program Never Outside program
Age adjusted * 0∙96 (0∙81, 1∙14) 0∙85 (0∙65, 1∙12) 1∙03 (0∙84, 1∙26)
Additionally adjusted for:    
Parity 0∙96 (0∙81, 1∙15) 0∙86 (0∙65, 1∙03) 1∙02 (0∙84, 1∙26)
Hormone therapy use 0∙96 (0∙81, 1∙14) 0∙90 (0∙69, 1∙18) 0∙99 (0∙81, 1∙22)
Maternal history of cancer 0∙96 (0∙81, 1∙13) 0∙86 (0∙65, 1∙12) 1∙01 (0∙83, 1∙25)
Body mass index (<25, 25+) 0∙97 (0∙82, 1∙16) 0∙85 (0∙64, 1∙12) 1∙05 (0∙85, 1∙29)
Education (primary, secondary, college) 0∙99 (0∙83, 1∙18) 0∙86 (0∙65, 1∙15) 1∙06 (0∙86, 1∙31)
Full model 1∙00 (0∙84, 1∙20) 0∙93 (0∙69, 1∙25) 1∙04 (0∙84, 1∙29)
  1. Mammography Evaluation Cohort data are from the Norwegian Women and Cancer cohort, 2005–2010. Women in the mammogram screening program are the reference group. RR calculated for women who reported never having a mammogram (never) and those who only had mammograms outside the screening program (outside program).
  2. *Age groups: 52–55, 56–59, 60–64, 65–69, 70–79.