Volume 126, Issue 5, Pages 1247-1256 (May 2004) Wide variation in adenoma detection rates at screening flexible sigmoidoscopy  Wendy Atkin, Pauline Rogers, Christopher Cardwell, Claire Cook, Jack Cuzick, Jane Wardle, Rob Edwards  Gastroenterology  Volume 126, Issue 5, Pages 1247-1256 (May 2004) DOI: 10.1053/j.gastro.2004.01.023

Figure 1 Graph of ADRs in all 13 endoscopists combined in successive cohorts of 200 people screened by each endoscopist. Thus, each point represents 2600 people. The final 8 points representing fewer than 2600 people were excluded. Gastroenterology 2004 126, 1247-1256DOI: (10.1053/j.gastro.2004.01.023)

Figure 2 Graphs of ADRs in successive cohorts of 200 people screened by each endoscopist. Endoscopists are ranked in descending order of ADR within each performance group. 95% CI bands for the overall ADR in the higher centers (15%; 95% CI for 200 examinations, 10%–20%) are superimposed on each graph. Gastroenterology 2004 126, 1247-1256DOI: (10.1053/j.gastro.2004.01.023)