Estimating the prevalence of breast cancer using a disease model: data problems and trends

Table 1 Comparison of the total number of prevalent cases of breast cancer, estimated in different ways, and 1993 prevalence data.

	Total number of cases estimated	% difference from 1993 data	% of the gap explained
1993 data	123216	0.0	0.0
Baseline	66370	85.6	100.0
Combined	89169	34.4	59.9
>1970	101268	52.6	38.6
1% trend	103943	56.6	33.9
SP	113440	70.9	17.2
mortality	119769	80.5	6.1

Baseline: baseline calculation, combined: adjusting for one-% trend and excluding incident cases of before 1970, >1970: excluding incident cases of before 1970, 1% trend: estimating the effect of a secular trend in incidence, SP: adjusting for secondary primaries, mortality: including excess mortality from non-breast cancer deaths.

ISSN: 1478-7954