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Table 2 Observed, predicted, screen-detected breast cancer cases and observed corrected-for-lead-time cases, by age group

From: Estimate of overdiagnosis of breast cancer due to mammography after adjustment for lead time. A service screening study in Italy

Age group (years) O P O/P Screen-detected Oc Oc/P 95% CI, Oc/P
50–54 1,957 1,328.1 147.4 749 1,426 107.4 102–113
55–59 2,017 1,418.8 142.2 950 1,410 99.4 94–105
60–64 2,192 1,555.8 140.9 995 1,566 100.7 96–106
65–69 2,340 1,605.8 145.7 1,031 1,697 105.7 101–111
70–74 1,788 1,646.9 108.6 127 1,807 109.7 105–115
50–74 10,294 7,555.3 136.2 3,852 7,906 104.6 102–107
  1. O, observed; P, predicted; Oc, observed corrected for lead time; CI, confidence interval.