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. 2018 Jun 13;25(Suppl 1):S115–S124. doi: 10.3747/co.25.3770

TABLE I.

Screening recommendations, by organization

Organization Target age (years) Screening interval (years) Period (years) Number needed Relative risk reduction

To screen To invite
Canadian Task Force on Preventive Health Care13 50–74 2–3 11 NA Age 40–49: 2108 0.82
Age 50–69: 721
Canadian Association of Radiologists14 40–74+a Age 40–49: 1 40+ NA NA NA
Age 50–74+: 1–2
U.S. Preventive Services Task Force15 50–74 2 10 NA Age 40–49: 3333 Age 39–49: 0.88
Age 50–59: 1250 Age 50–59: 0.86
Age 60–69: 476 Age 60–69: 0.67
Age 70–74: 769 Age 70–74: 0.80
American Cancer Society10 45+b Age 45–54: 1 15 Age 40–49: 753 1770 0.75 Invited to screening
Age 55: 2 Age 50–59: 462 835 0.62 Attending screening
Age 60–69: 355 835
American College of Radiology16 40c 1 40+ NA NA NA
American College of Obstetricians and Gynecologists17 40–75 1–2 40+ NA NA NA
U.S. National Comprehensive Cancer Network18 40d 1 40+ NA NA NA
Cochrane Systematic Review19 NA NA 10 NA 2000 0.81
U.K. Independent Review5 50–70e 3 20 50–79: 180 NA 0.80
a

Continue as long as life expectancy is 7–10 years.

b

Continue as long as life expectancy is ≥10 years.

c

Continue until life expectancy is <5–7 years.

d

Continue until life expectancy is ≤10 years.

e

The U.K. National Health Service is in the process of extending breast cancer screening to include mammography in women 47–73 years of age.

NA = not available.