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Table 2 Overall agreement of invasive and non-invasive histologies in participants of the Million Women Study

From: Breast cancer histological classification: agreement between the Office for National Statistics and the National Health Service Breast Screening Programme

  NHSBSP Total
ONS Invasive Non-invasive  
   Invasive 4,567 148 4,715
   Non-invasive 54 1,117 1,171
Total 4,621 1,265 5,886
Percentage agreement    96.6%
Kappa statistic    0.9
Test for heterogeneity    
   X21    6.1
   p    0.01
  1. NHSBSP, National Health Service Breast Screening Programme; ONS, Office for National Statistics.