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Table 3 Development of breast cancers among the non-attendees, screen-detected breast cancers, and interval breast cancers from 2000–2002 to 2007–2010 (expansion period) by incidence rate ratios (IRR) with 95% confidence intervals (95% CI) in ages 50–59, 60–69, and 50–69 years

From: Breast carcinoma detection modes and death in a female population in relation to population-based mammography screening

50-59 years
	Non-attendee		Screen-detected		Interval
	IRR	95% CI	IRR	95% CI	IRR	95% CI
Period
2000-2002	1		1		1
2003-2006	0.98	0.87-1.10	1.07	1.01-1.13	0.97	0.90-1.05
2007-2010	1.23	1.09-1.38	1.05	0.99-1.11	0.92	0.85-0.99
60-69 years
	Non-attendee		Screen-detected		Interval
	IRR	95% CI	IRR	95% CI	IRR	95% CI
Period
2000-2002	1		1		1
2003-2006	0.83	0.65-1.06	1.07	0.95-1.21	1.09	0.93-1.29
2007-2010	1.04	0.84-1.29	1.26	1.13-1.41	0.77	0.66-0.89
50-69 years
	Non-attendee		Screen-detected		Interval
	IRR	95% CI	IRR	95% CI	IRR	95% CI
Period
2000-2002	1		1		1
2003-2006	0.95	0.85-1.06	1.06	1.01-1.12	0.99	0.93-1.07
2007-2010	1.18	1.07-1.31	1.11	1.05-1.16	0.87	0.81-0.93

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