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Table 1 Breast cancer incidence model; Catalonia 1980 to 2004

From: Breast cancer incidence and overdiagnosis in Catalonia (Spain)

  Coef. Std. error P -value
Age1 -38.8418 1.0854 < 0.001
Age2 0.0005 0.0002 0.002
PM501 0.6250 0.9878 < 0.001
YB1 0.0111 0.0026 < 0.001
Constant -6.0626 0.0156 < 0.001
  1. The dependent variable is the number of observed incidence cases. The model has an offset, which is a term with coefficient constrained to 1. offset = log(exposed) 0.15 CFR, Age1 = (age/10)-2 - 0.0331, Age2 = (age/10)3 - 166.375, PM501 = PM500.5 - 0.4342, YB1 = year-of-birth-1937.5. CFR: completed fertility rate, PM50: proportion of women who were having periodic mammograms for early detection at age 50. Deviance = 482.53. The expected number of incident cases, E(I), can be obtained using the equation: E(I) = exp(-6.0626 - 38.8418 Age1 + 0.0005 Age2 + 0.6250PM501 + 0.0111YB1 + offset).