Dr Ken Swa
National Clinical Lead
Diabetic Retinopathy Screening Collaborative
National Services Scotland
Summary of EQA Autumn 2011
 98 % of graders completed all 100 images
 Median centre sensitivity – 93% to 100% ( previous
round - 82.5 % to 93.8%)
 Median centre specificity – 84.8% to 95.7% (previous
round 87.2% to 93.6%)
 Overall median sensitivity / specificity – 95.3% /
91.3% (previous round – 90.0%/91.5% )
Summary of EQA 2011
Spring 2011
Autumn 2011
Sensitivity at least 80%
83.9%
92%
Specificity at least 80%
93%
91.0%
Sensitivity/Specificity at
least 80%
78.2%
82.8%
EQA Spring 2011
EQA Autumn 2011
ROC Chart Spring 2011
ROC Chart Autumn 2011
EQA Trends
EQA - Message
 EQA image grading is NOT live grading
 Everyone should grade EQA images like live grading
 It aims to reflect image grading quality of all graders
 There is room for improvement for ALL
 Education , training and feedback is key
 Outliers need to be handled sensitively and in
confidence
 DRS need to develop a robust and consistent national
policy