Table 3.

Breast cancer cases in the screened and nonscreened cohort, and the inevitable proportion of overdiagnosis in Norway

Age, yearsMortality rate 2010–2012 (per 1000)15Population (n)Breast cancer incidence (per 100,000 women-years)Breast cancer, population (n)Breast cancer, screened cohort (n)Breast cancer, nonscreened cohort (n)Cumulative no of breast cancer, screened cohort (n)Cumulative no of breast cancer, nonscreened cohort (n)Difference in the cumulative no of the screened and nonscreened cohort (n)Mortality (n)Over-diagnosis (%)
501.9100,000114.11144581144581143440.6
512.299,814114.51144812299393435961.3
522.199,597115.71153312301,2705736961.5
532.499,388117.71173302341,6008077931.9
542.999,148117.41162922331,8921,0408522.5
553.098,856121.61202992412,1911,2809102.8
563.598,556127.01252882502,4791,5319483.3
573.898,210134.41322942642,7731,7959783.7
583.897,836135.91332932663,0662,0611,0063.8
594.397,464140.41373002743,3662,3341,0324.5
605.197,041144.41403062803,6732,6141,0585.4
615.196,550151.11463142923,9872,9061,0805.5
626.096,055153.31473212954,3083,2011,1076.6
636.195,479155.21483302964,6383,4971,1406.9
647.194,901159.01513393024,9763,7991,1778.3
657.894,230167.61583483165,3244,1151,2099.4
668.193,496175.01643553275,6794,4421,23710.0
679.492,742182.61693613396,0404,7811,25911.8
6810.691,874187.51723663456,4065,1251,28113.6
6910.590,901197.41793693596,7755,4841,29113.6
7011.689,943204.8184473686,8225,85396911.3
7113.188,898212.71891063786,9286,2316989.2
7215.187,730210.81851603707,0886,6014887.4
7316.886,406213.51842103697,2996,9703295.5
7418.484,956216.41842513687,5507,3372123.9
7521.083,397226.01882923777,8417,7141272.7
7623.781,645228.81873153748,1568,088691.6
7725.879,712232.61853333718,4908,459310.8
7829.777,652230.51793363588,8268,81790.3
7934.075,345234.51771671778,9938,99300.0
159.61.8