Table 2.

Recommendations at Surveillance Depending on Most Recent Preceding Colonoscopy and Surveillance Findings

Most recent preceding colonoscopy findings	First surveillance findings	Guideline-recommended interval for second surveillance (y)	N	Adherent with guidelines N (%)	Recommendations earlier than guidelines N (%)	Recommendations later than guidelines N (%)	Recommendations not available N (%)
Pre-2012 guidelinesa
Low-risk adenoma	High-risk adenoma	3	5	5 (100)	NA	NA	NA
	Low-risk adenoma	5–10 implied	15	10 (67)	4 (27)	0	1 (7)
	No adenoma	5–10 implied	23	19 (83)	2 (9)	0	2 (9)
High-risk adenoma	High-risk adenoma	3	22	16 (73)	6 (27)	0	0
	Low-risk adenoma	5	23	11 (48)	10 (43)	1 (4)	1 (4)
	No adenoma	5	21	12 (57)	6 (29)	0	3 (14)
No adenoma	High-risk adenoma	3	33	23 (70)	8 (24)	1 (3)	1 (3)
	Low-risk adenoma	5–10 implied	57	42 (74)	14 (25)	0	1 (2)
	Stringent Scenario: No adenoma, assuming no prior advanced adenoma or advanced sessile serrated lesion ever	5–10 implied	62	56 (90)	6 (10)	0	0
	Liberal Scenario: No adenoma, assuming ≥1 prior advanced adenoma or advanced sessile serrated lesion ever	5 implied	62	55 (89)	6 (10)	1 (2)	0
Post-2012 guidelines
Low-risk adenoma	High-risk adenoma	3	5	2 (40)	1 (20)	0	2 (40)
	Low-risk adenoma	5	19	15 (79)	3 (16)	0	1 (5)
	No adenoma	10	26	0	23 (88)	0	3 (12)
High-risk adenoma	High-risk adenoma	3	22	16 (73)	6 (27)	0	0
	Low-risk adenoma	5	31	20 (65)	10 (32)	0	1 (3)
	No adenoma	5	25	16 (64)	7 (28)	1 (4)	1 (4)
No adenoma	High-risk adenoma	3	35	22 (63)	12 (34)	1 (3)	0
	Low-risk adenoma	5–10 implied	47	36 (77)	9 (19)	0	2 (4)
	Stringent Scenario: No adenoma, assuming no prior advanced adenoma or advanced sessile serrated lesion ever	10	56	12 (21)	42 (75)	0	2 (4)
	Liberal Scenario: No adenoma, assuming ≥1 prior advanced adenoma or advanced sessile serrated lesion ever	5 implied	56	37 (66)	5 (9)	12 (21)	2 (4)
Delayed post-2012 guidelines
Low-risk adenoma	High-risk adenoma	3	3	3 (100)	NA	NA	NA
	Low-risk adenoma	5	3	1 (33)	1 (33)	1 (33)	0
	No adenoma	10	3	0	3 (100)	NA	NA
High-risk adenoma	High-risk adenoma	3	17	12 (71)	4 (24)	0	1 (6)
	Low-risk adenoma	5	19	12 (63)	5 (26)	0	2 (11)
	No adenoma	5	13	10 (77)	2 (15)	0	1 (8)
No adenoma	High-risk adenoma	3	28	22 (79)	3 (11)	3 (11)	0
	Low-risk adenoma	5–10 implied	42	33 (79)	6 (14)	0	3 (7)
	Stringent Scenario: No adenoma, assuming no prior advanced adenoma or advanced sessile serrated lesion ever	10	54s	11 (20)	40 (74)	0	3 (6)
	Liberal Scenario: No adenoma, assuming ≥1 prior advanced adenoma or advanced sessile serrated lesion ever	5 implied	54	37 (69)	3 (6)	12 (22)	2 (4)

^aFor colonoscopies performed prior to September 2012, provider surveillance recommendations were compared to the 2006 USMSTF guidelines.