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

Figure 1.

Figure 1

Figure 1

Control charts for individual pathologists. Each panel (control chart) in this figure is one diagnosis (e.g. SSA) for a pathologist that read > 150 CRPS/year in the seven years of the study. The black circles represent the normalized PDR in different years; the denominator within the normalized PDR is the number of colorectal polyp specimens read by the individual pathologist in the year. The thick solid black line is the pathologist’s average (or mean) call rate (PACR). The dashed blue control lines above and below the PACR are 2 standard deviations (SDs) from the PACR; points outside the range are p < 0.05. The solid blue control lines represent 3 SDs from the PACR; points outside the range are p < 0.003. The outer finely dashed blue control lines above/below the PACR are 5 SDs and 7 SDs from the PACR respectively; points above/below the lines are p < 6e−7 and p < 3e−12 respectively. Controls lines may be absent if the PACR is close to zero (as negative normalized PDRs do not have a physical interpretation). The individual panels (control charts) are (A) high-grade dysplasia (HGD) showing the “in control” condition; (B) tubulovillous adenoma + villous adenoma (TVA + VA) showing the “in control” condition; (C) sessile serrated adenoma (SSA) showing the “in control” condition; (D) hyperplastic polyp (HP) with a “blip” (> 2 SDs/P < 0.05 outlier) in year two of the study; (E) HGD with a “blip” (P < 0.003 outlier) in year one of the study; (F) HGD with a “trend” (non-significant, not crossing control lines); (G) SSA with a “trend” (significant, crossing control lines); (H) TVA + VA with a “trend” (significant, crossing control lines); (I) HGD with a “step” (significant, crossing control lines); (j) TVA + VA with a “step” (significant, crossing control lines).