Incidence of advanced-stage breast cancer in regular participants of a mammography screening program: a prospective register-based study

Table 3 Numbers and incidence rate of advanced stage breast cancer (UICC II+] in the period after the initial screening (interval ABC plus ABC detected at first subsequent screening] and in the period after the first subsequent screening (interval ABC plus ABC detected at the second subsequent screening], compared with the reference ABC incidence rate and expressed as a relative reduction (in %). Regular participants of the mammography screening program in North Rhine-Westphalia, 2005 to 2013

	UICC II + interval cancers		UICC II + breast cancers detected at screening		Total rate of UICC II+ cancers	Reference incidence rate of UICC II+ cancers	Relative reduction^b
	n	24-months rate /100,000^a [95% CI]	n	24-months rate /100,000^a [95% CI]	24-months rate /100,000^a [95% CI]	24-months rate /100,000^a [95% CI]	(%)
First period after the initial screening	1708	143.5 [136.7; 150.3]	762	148.1 [137.5; 158.8]	291.6 [279.0; 304.2]	349.4 [319.4; 379.6]	16.5 [9.8; 22.8]
Second period after the first subsequent screening	643	127.7 [117.7; 137.7]	323	147.3 [129.7; 165.0]	275.0 [254.7; 295.3]	349.4 [319.4; 379.6]	21.3 [13.5; 28.4]

^aage - standardized to the distribution of the 5-years age groups in the initial prevalence screening, 95% CI: 95% confidence interval
^bFormula see methods section

ISSN: 1471-2407