Per 1,000 screens, the number of breast cancer deaths prevented was 0.9 for a screening interval of 1 year for over 65s, 1.5 years for a screening interval of 2 years for over 65s, 1.8 years for a screening interval of 3 years for over 65s and 1.1 years for the basic programme.
The number of life years gained per 1,000 screens was 8 for a screening interval of 1 year for over 65s, 12 for a screening interval of 2 years for over 65s, 15 for a screening interval of 3 years for over 65s and 21 for the basic programme.
The extra-incidence per life year gained was 0.21 for a screening interval of 1 year for over 65s, 0.24 for a screening interval of 2 years for over 65s, 0.27 for a screening interval of 3 years for over 65s and 0.01 for the basic programme.
The extra life-years with disease per life year gained were 3.5 for a screening interval of 1 year for over 65s, 3.8 for a screening interval of 2 years for over 65s, 4.2 for a screening interval of 3 years for over 65s and 0.7 for the basic programme.
Benefits were sensitive to the upper age limit of the screening programme and to the duration of the screen-detectable pre-clinical period.