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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