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Table 3 Distribution of different DCIS grades by screening status and age group

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

   Detected at mass screening Screen negative P value
   N % N %  
Age group       
<49   0   0   
  Low-grade DCIS 0 n.a. 0 n.a.  
  Intermediate-grade DCIS 0 n.a. 0 n.a.  
  High-grade DCIS 0 n.a. 0 n.a.  
49–75   1429   261   
  Low-grade DCIS 234 16.4 % 49 18.8 %  
  Intermediate-grade DCIS 452 31.6 % 71 27.2 % 0.579
  High-grade DCIS 743 52.0 % 141 54.0 %  
>75   1   2   
  Low-grade DCIS 0 0.0 % 0 0.0 %  
  Intermediate-grade DCIS 0 0.0 % 2 100.0 % 0.297
  High-grade DCIS 1 100.0 % 0 0.0 %  
  1. The P values indicate the significance of the difference of these distributions between screening status. Low-grade DCIS: DCIS with a low malignant potential. Intermediate-grade DCIS: DCIS with an intermediate malignant potential. High-grade DCIS: DCIS with a high malignant potential
  2. DCIS ductal carcinoma in situ, n.a. not applicable
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