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Table 2 Descriptive statistics of the DCIS cases reviewed

From: The distribution of ductal carcinoma in situ (DCIS) grade in 4232 women and its impact on overdiagnosis in breast cancer screening

  Known at mass screening Not known at mass screening P value
  N % N %  
Patients 4.075   8.226   
Exclusions 2.382 58 % 5.687 69 %  
Inclusions 1.693 42 % 2.539 31 %  
Year diagnosis      
2007 429 25 % 865 34 % <0.001
2008 583 34 % 806 32 %  
2009 681 40 % 868 34 %  
Age group      
<49 0 0 % 651 26 % <0.001
49–75 1.690 100 % 1.686 66 %  
>75 3 0 % 202 8 %  
Screen result      
Positive screen 1.430   n.a.   
No positive screen 263   n.a.   
  Mean   Mean   
Age 60.8   56.3   <0.001
  1. ‘Known at mass screening’ are all women who were listed in the database of the screening organisations with a positive or a negative screen, ‘Not known at mass screening’ are all women who were not mentioned in the screening organisation’s database
  2. DCIS ductal carcinoma in situ, n.a. not applicable
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