Table 3. Diagnostic yield of EAG in each endoscopist at the pre- and post-intervention.

Groups		Pre-intervention	Post-intervention	Ratio of variancea	P value
Overall (mean ± SD, %)		43.1 ± 10.7	46.8 ± 5.93	0.31	0.075
Experienced groupb		45.2 ± 5.5	47.1 ± 8.8	2.62	0.374
	A	38.2	50.3
	B	50.5	44.4
	C	40.8	40.6
	D	47.2	39.3
	E	49.5	60.9
Less-experienced groupc		41.3 ± 14.1	46.6 ± 2.8	0.04	0.003
	F	33.9	44.3
	G	51.9	43.2
	H	33.0	46.2
	I	28.0	48.1
	J	64.7	51.1
	K	36.1	46.8

EAG = endoscopic atrophic gastritis, SD = standard deviation.

^aVariability of diagnostic yield was calculated by F-test. Ratio of variance showed the diagnostic variability in each endoscopist at the post-intervention compared with pre-intervention; ^bExperienced group was defined by their endoscopic experience over 10 years; ^cLess-experienced group was defined by their endoscopic experience less than 10 years.