Association of trainee participation with adenoma and polyp detection rates

Table 1 Characteristics of patients undergoing screening colonoscopy (n = 7503), by gastroenterology fellow participation; Grady Memorial Hospital, Atlanta, Georgia, July 1, 2009 – July 1, 2015

Characteristic	Attending alone (n = 2464, 32.8%)	Attending with fellow (n = 5039, 67.2%)	P value1
Age in years (mean ± SD)	57.9 ± 7.1	58.3 ± 7.1	0.02
Female sex, n (%)	1572 (63.8)	3161 (62.7)	0.37
Race, n (%)
White	120 (4.9)	261 (5.2)	0.15
Black	2198 (89.2)	4423 (87.8)
Other	146 (5.9)	355 (7.1)
Preparation quality, n (%)
Good	2199 (89.3)	4469 (88.7)	0.02
Fair-adequate	152 (6.2)	382 (7.6)
Fair-inadequate	113 (4.6)	188 (3.7)
Fellow training level, n (%)
1st 6 mo	N/A	627 (12.4)
2nd 6 mo	N/A	651 (12.9)
2nd year	N/A	1413 (28.0)
3rd year	N/A	2348 (46.6)
≥ 1 adenoma (ADR), n (%)	756 (30.7)	1736 (34.5)	0.001
≥ 1 advanced adenoma (AADR), n (%)	215 (8.7)	416 (8.3)	0.49
≥ 1 polyp (PDR), n (%)	988 (40.1)	2244 (44.5)	0.0003
≥ 1 adenoma in right colon (RT-ADR), n (%)	521 (21.1)	1212 (24.1)	0.005
≥ 1 adenoma in left colon (LT- ADR), n (%)	365 (14.8)	862 (17.1)	0.01
Mean number of APC	0.61	0.68	0.03
Mean number of PPC	0.86	0.96	0.01

¹P value from χ² test for categorical variables, and student t test for continuous variables. ADR: Adenoma detection rate; PDR: Polyp detection rate; AADR: Advanced adenoma detection rate; APC: Adenomas per colon; PPC: Polyps per colon.