Endoscopists and endoscopic assistants’ qualifications, but not their biopsy rates, improve gastric precancerous lesions detection rate

Table 3 Relationship between endoscopist biopsy rate and positive/negative lesion detection, n (%)

Endoscopist	EBR	Gastroscopes	GPCs	GPLs	Negative biopsies	EBR group	OR for GPCs, 95%CI	OR for GPLs, 95%CI	OR for negative biopsies, 95%CI
1	13.94%	1466	19 (21.84)	0 (0)	63 (72.41)	Low EBR (13.94%-23.44%)	1.00, -	1.00, -	1.00, -
2	17.06%	1668	29 (23.58)	3 (2.44)	86 (69.92)
3	18.95%	108865	527 (29.28)	136 (7.56)	1052 (58.44)
4	21.23%	5268	118 (25.93)	22 (4.84)	303 (66.59)
5	21.53%	32126	347 (24.47)	52 (3.67)	968 (68.27)
6	21.96%	19484	238 (24.64)	52 (5.38)	645 (66.77)
7	22.15%	16212	280 (23.08)	66 (5.44)	820 (67.6)
8	22.30%	7349	139 (25.23)	37 (6.72)	357 (64.79)
9	23.16%	35092	277 (21.9)	64 (5.06)	883 (69.8)
10	23.44%	39896	487 (28.15)	113 (6.53)	1083 (62.6)
11	23.48%	10006	267 (30.34)	37 (4.2)	551 (62.61)	Moderate EBR (23.45%-25.98%)	1.16, 1.09-1.24	0.95, 0.86-1.05	0.89, 0.84-0.94
12	23.67%	6820	189 (28.29)	31 (4.64)	429 (64.22)
13	23.68%	16172	311 (23.52)	46 (3.48)	924 (69.89)
14	23.72%	3992	103 (29.26)	15 (4.26)	222 (63.07)
15	24.18%	18608	350 (29.79)	52 (4.43)	737 (62.72)
16	24.42%	27558	415 (27.36)	103 (6.79)	957 (63.09)
17	24.80%	9816	279 (31.89)	51 (5.83)	518 (59.2)
18	24.96%	132205	1638 (27.42)	358 (5.99)	3717 (62.23)
19	25.98%	27800	423 (29.27)	131 (9.07)	846 (58.55)
20	26.35%	4666	171 (36.85)	24 (5.17)	255 (54.96)	High EBR (25.99%-31.39%)	1.28, 1.19-1.38	0.94, 0.84-1.05	0.82, 0.76-0.88
21	27.49%	5890	185 (29.55)	21 (3.35)	398 (63.58)
22	28.15%	22349	409 (30.16)	61 (4.5)	855 (63.05)
23	28.37%	17985	383 (27.81)	71 (5.16)	887 (64.42)
24	28.90%	12956	412 (27.93)	86 (5.83)	947 (64.2)
25	29.65%	18638	426 (30.45)	82 (5.86)	864 (61.76)
26	30.16%	18413	292 (26.67)	50 (4.57)	732 (66.85)
27	31.08%	19148	397 (33.5)	64 (5.4)	698 (58.9)
28	31.39%	25385	379 (29.61)	57 (4.45)	829 (64.77)
29	32.55%	18142	421 (43.49)	126 (13.02)	392 (40.5)	Very high EBR (31.40%-40.17%)	1.48, 1.38-1.58	0.9, 0.81-1	0.73, 0.68-0.77
30	32.58%	26041	460 (31.68)	65 (4.48)	888 (61.16)
31	32.69%	7379	244 (28.91)	50 (5.92)	519 (61.49)
32	33.09%	12300	418 (31.19)	74 (5.52)	812 (60.6)
33	33.29%	35746	748 (36.65)	129 (6.32)	1121 (54.92)
34	33.83%	8756	410 (33.61)	71 (5.82)	718 (58.85)
35	34.89%	23507	488 (29.24)	81 (4.85)	1055 (63.21)
36	35.98%	1642	72 (24.83)	5 (1.72)	207 (71.38)
37	40.17%	12100	523 (27.32)	96 (5.02)	1269 (66.3)

EBR: Endoscopist biopsy rate; GPCs: Gastric precancerous conditions; GPLs: Gastric precancerous lesions; OR: Odds ratio; CI: Confidence interval.