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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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Breast Cancer Research

ISSN: 1465-542X

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