Dr. Jennifer Anne Cooper Profile

Dr. Jennifer Anne Cooper

at The University of Warwick

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Proceedings Article | 4 March 2019 Presentation + Paper

Blinding of the second reader in mammography screening: impact on behaviour and cancer detection

Jennifer Anne Cooper, David Jenkinson, Sian Taylor-Phillips

Proceedings Volume 10952, 109520T (2019) https://doi.org/10.1117/12.2512090

KEYWORDS: Cancer, Mammography, Breast cancer, Breast, Statistical analysis, Data modeling

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Background: The policy of the NHS Breast Cancer Screening Programme is for each woman’s mammograms to be examined by two separate readers, working independently. In practice, sometimes the second reader (reader 2) can see the decision of the first reader (reader 1). The National Breast Screening Service (NBSS) computer software automatically records whether the second reader can see the decision of the first reader or whether they are ‘blinded’. This study aimed to determine the effect of blinding the second reader on the recall rate and cancer detection rate of reader 2. Methods: Data were from eight screening centers based in the Midlands area in England participating in the 'Changing Case Order to Optimize Patterns of Performance in Screening (CO-OPS)' clinical trial. A three-level Markov Chain Monte Carlo multilevel model was fitted to determine the effect of blinding reader 2 on recall rate and cancer detection. Results: 207,595 women were included in the analysis, of whom 1,796 had cancer detected. Reader 2 was blinded to reader 1’s decisions for 54.5% (113,029/207,595) cases. If reader 2 is blinded, there is a high probability that they are more likely to recall than if they were not blinded for a prevalent case but less likely to recall an incident case. The interaction effects on reader 2’s cancer detection rate were not significant. Conclusion: If the second reader is not blinded to the decision of the first reader, they appear to be influenced by the first reader’s decision suggesting that reading is not independent.

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