Table 3.

Estimated number of high-risk women undergoing screening mammography in British Columbia and additional MRI resources required for adjunct screening of these women

10-Year risk (Tyrer–Cuzick model)10-Year risk (Gail model)
>8% risk threshold>8% risk threshold
Age group% High risk#BC women#MRI% High risk#BC Women#MRI
40–492.30%4,0700.90.16%2810.1
50–593.50%6,0611.40.75%1,2900.3
60–694.00%4,9621.12.41%2,9980.7
70–795.82%4,3211.01.72%1,2800.3
All women (40–79)19,4144.45,8491.4

NOTE: Percentages of high-risk women are based on risk estimates from a sample of 4,266 women attending the Screening Mammography Program of British Columbia, using the NICE 10-year risk guidelines to evaluate the Tyrer–Cuzick and Gail models.