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For the whole study period, follow-up screening ceased after two negative ward screens, usually performed three to four weeks apart.
Most of the deficit was expected directly when screening ceased: in the age group 70 74 years before 1998 and in the age group 75 79 years from 1998 onward.
Mammography screening programmes fall under provincial jurisdiction and were not introduced in Canada until after screening ceased in the Canadian National Breast Screening Study, initially in British Columbia in 1988, then in Ontario and Alberta in 1990, Nova Scotia in 1991, Manitoba in 1995, and Quebec in 1998.
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However, as stated Therefore this study can only draw conclusions based on figures for screening, ceasing and non-response to invitations for screening.
However, a high proportion of individuals being screened ceased being exposed many years ago; for example, many had been employed in the former nuclear weapons industry.
However, when screening ceases, the incidence should fall back (sometimes referred to as the compensatory drop).
This 'prevalence peak' will be followed by a corresponding decrease once screening ceases.
In principle, when screening ceases the incidence should fall back so that by the end of the screening period plus lead time, the cumulative incidence in the screened and control populations should be the same.
If there is no overdiagnosis, the cumulative incidence in the screened and unscreened women will equalise after screening ceases, after a period equivalent to the lead time has elapsed.
It is clear that there is a benefit of screening women up to age 70, but how long that benefit lasts if screening ceases at age 70, and what sort of non-intensive regimen might be offered to older women is not clear.
If screening doesn't screen, it ceases to be useful.
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