Table 1.

(Subsection a) Comparison of pathologists to self. Number of outlier years for all pathologists with seven years of data. There are 15 pathologists with 7 years of data; thus, there are 105 pathologist x years, (Subsection b) Comparison to pathologists to self (normalized). Fraction that are outliers for control charts centred on the pathologist’s mean diagnostic rate. The numbers in this table are generated by dividing through by the total number of pathologist x years (105), e.g. 9/105 = 0.09 for HGD 2 SD. SD = standard deviation.

Variation	HGD	TVA + VA	TA_ad	HP	SSA
Subsection a
< 2 SD	96	81	82	72	71
> 2 SD	9	24	23	33	34
> 3 SD	2	10	8	10	18
> 5 SD	0	2	1	0	10
> 7 SD	0	1	0	0	5
PY (Total)	105	105	105	105	105

Variation	HGD	TVA + VA	TA_ad	HP	SSA
Subsection b
< 2 SD	0.91	0.77	0.78	0.69	0.68
> 2 SD	0.09	0.23	0.22	0.31	0.32
> 3 SD	0.02	0.10	0.08	0.10	0.17
> 5 SD	0.00	0.02	0.01	0.00	0.10
> 7 SD	0.00	0.01	0.00	0.00	0.05

HGD high-grade dysplasia, HP hyperplastic polyp, SSA sessile serrated adenoma, TVA + VA tubulovillous adenoma + villous adenoma, TA_ad tubular adenoma + adenoma NOS, PY pathologist-years; 15 pathologists × 7 years = 105 pathologist × years.