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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