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Table 1 Woman-years at risk, and observed and expected incidence and mortality rates (/100) of breast cancer in Finland in 1998–2002 by age group. The expected rates are based on an extrapolation of models fitted in the data during 1971–1986 (before screening era).

From: Impacts of the Finnish service screening programme on breast cancer rates

 

Age group (years)

 

40–44

45–49

50–54

55–59

60–64

65–69

40–69

50–69

Woman-years at risk

943,300

992,500

1,034,400

788,500

680,900

614,900

5,054,500

3,118,700

Incidence, any

        

Observed with screening

0.108

0.217

0.279

0.290

0.285

0.294

0.239

0.286

Expected without screening1

0.113

0.211

0.236

0.261

0.288

0.309

0.237

0.262

Excess relative risk (in %)1

-4

3

18*

11*

-1

-5

1

9*

Incidence, localised at diagnosis

        

Observed with screening

0.054

0.119

0.168

0.182

0.182

0.181

0.143

0.177

Expected without screening1

0.045

0.095

0.128

0.131

0.158

0.173

0.116

0.141

Excess relative risk (in %)1

20*

26*

56*

39*

15*

5

23*

26*

Incidence, non-localised at diagnosis

        

Observed with screening

0.056

0.093

0.098

0.092

0.092

0.104

0.088

0.097

Expected without screening1

0.071

0.100

0.105

0.112

0.117

0.124

0.105

0.106

Excess relative risk (in %)1

-21*

-7

-6

-18*

-21*

-16*

-16*

-9*

Mortality

        

Observed with screening

0.017

0.028

0.044

0.048

0.056

0.067

0.041

0.052

Expected1 without screening

0.012

0.022

0.035

0.046

0.057

0.064

0.037

0.051

Excess relative risk1 (in %)

42*

29*

24

5

-2

4

10

3

  1. 1 (Observed – expected)/expected * Significant at 0.05 level