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. 2021 Aug 20;11:16942. doi: 10.1038/s41598-021-95862-2

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Control charts showing the normalized pathologist diagnostic rates (PDRs) for the 27 pathologists reading > 600 CRPS in the seven year study period. Each panel (control chart) in this figure is one diagnosis, e.g. SSA. The different markers (red circles, blue Xs, black boxes) represent individual pathologists from different hospitals. The solid black line is the group median diagnostic rate (GMDR). The dashed blue control lines above and below the GMDR are 2 standard deviations (SDs) from the GDMR; pathologists outside the inner funnel are statistically different than the GMDR (p < 0.05). The solid blue control lines above and below the GMDR represent 3 SDs; pathologist outside the outer funnel are statistically different than the GMDR (p < 0.003). The outer finely dashed blue control lines above/below the GMDR are 5 SDs and 7 SDs from the GMDR respectively; points above/below the lines are p < 6e−7 and p < 3e−12 respectively. Controls lines may be absent if the GMDR is close to zero (as negative normalized PDRs do not have a physical interpretation). The individual panels (control charts) are (A) normalized high-grade dysplasia (HGD) PDRs; (B) normalized tubulovillous adenoma + villous adenoma (TVA + VA) PDRs; (C) normalized tubular adenoma and adenoma not otherwise specified (TA_ad) PDRs; (D) normalized hyperplastic polyp (HP) PDRs; (E) normalized sessile serrated adenoma (SSA) PDRs, only the 26 of the 27 pathologists shown; one pathologist had a normed diagnostic rate > 25% (not shown).