Table 1.

Effectiveness of the current mammography screening programme and the efficacy of a programme with full coverage

Cell number	Age band	Relative risk of breast cancer mortality attributable to current programme	Coverage in this age band (%)			Relative risk of breast cancer mortality in this age band with 100% coverage
			Current programme	With 100% coverage	Without screening
		A	B	C	D	E = 1−[(1−A) / (B × C)]
1	40–44	1.0000*	61.3	100	0	1.0000
2	45–49	0.8500	61.3	100	0	0.7553
3	50–54	0.8400	66.5	100	0	0.7594
4	55–59	0.8400	66.5	100	0	0.7594
5	60–64	0.8400	66.5	100	0	0.7594
6	65–69	0.8400	63.0	100	0	0.7460
7	70–74	0.8400	63.0	100	0	0.7460

*Screening has no effect on mortality for first 5 years