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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.