The projection of size of the Ontario population showed an increase for all age groups. For example, from 2001 to 2021, the size of the Ontario population increased from 452,866 to 515,800 for the age group 30 - 34 years and from 107,580 to 202,300 for the age group 85+.
The incidence rates, prevalence rates and sensitivity rates depended on the stage and the age group.
For example, the prevalence rates (per 100,000) in Stage 0 were:
78 in the age group 30 - 34 years,
184.1 in the age group 35 - 39 years,
343.4 in the age group 40 - 44 years,
491.9 in the age group 45 - 49 years,
650 in the age group 50 - 54 years,
756.3 in the age group 55 - 59 years,
877.8 in the age group 60 - 64 years,
1,014.3 in the age group 65 - 69 years,
1,088.9 in the age group 70 - 74 years,
1,181.1 in the age group 75 - 79 years,
1,151.2 in the age group 80 - 84 years, and
1,108.3 in the age group 85+.
The incidence rates (cases per year) in Stage 0 were:
11 in the age group 30 - 34 years,
41 in the age group 35 - 39 years,
105 in the age group 40 - 44 years,
162 in the age group 45 - 49 years,
178 in the age group 50 - 54 years,
146 in the age group 55 - 59 years,
119 in the age group 60 - 64 years,
129 in the age group 65 - 69 years,
119 in the age group 70 - 74 years,
94 in the age group 75 - 79 years,
54 in the age group 80 - 84 years, and
34 in the age group 85+.
The sensitivity of mammography was 76% in the 30 - 44 age group and 74% in the 45 - 85 age group. The specificity was 91% for all age groups.