Patient age and duration of colonoscopy are predictors for adenoma detection in both proximal and distal colon

Table 1 Patient and procedural characteristics of 551 cases included in the analysis

Patients
Age (yr)	62 (18-90)
Gender: male/female	285 (52)/266 (48)
Setting: in-patient/out-patient	298 (54)/249 (46)
BMI	24.8 (15.1-41.5)
Sleep apnea syndrome: yes/no	17 (3)/528 (97)
Previously known sedation related complications: no/yes	540 (99)/7 (1)
ASA classification: I/II/III	160 (29)/215 (39)/173 (32)
Lung disease: yes/no	59 (11)/489 (89)
Heart disease: yes/no	132 (24)/416 (76)
Procedural measurements and safety monitoring
Using capnography	267 (50)
Investigation time (min)	32 (2-126)
Hypoxemia (at least one episode)	241 (44)
Hypoxemia (p02 < 90%; at least one episode)	71 (13)
Hypoxemia (p02 < 85%, at least one episode)	23 (4)
Hypotension (at least one episode)	10 (2)
Bradycardia (at least one episode)	50 (9)
Using midazolam	57 (10)
Using propofol	526 (95)
Propofol dose (mg)	140 (0-800)

Numbers are mean values (range: minimum-maximum) or frequencies (percentages). BMI: Body mass index.

Table 2 Colonoscopy outcome and Procedural findings (n = 551) n (%)

Finding	Total/detection rate
Colonic lesions (entire colon)
Lesions total (polyps, adenomas, carcinomas)	430
Polyps	412
Adenomas	220
Advanced adenomas	41
Carcinomas	18
Polyp detection rate1	37%
Adenoma detection rate1	22%
Cases with at least 1 adenoma	121
Cases with 2 or more adenomas	46
Other colonic pathology
Hemorrhoids	19 (3)
Stenosis	4 (1)
Angiodysplasia	14 (3)
Diverticula	53 (10)
Mucosal Bleeding	5 (1)
Mucosal inflammation	86 (16)

¹Detection rates were defined as number of colonoscopies in which one or more lesion was found divided by the number of colonoscopies performed.

Table 3 Local distribution of colon adenomas in 551 cases n (%)

Finding	Total/detection rate
Adenomatous lesion in the right colon
Adenomas	126
Adenoma detection rate1	13%
Advanced adenomas	23
Advanced adenoma deletion rate	19 (3)
Adenomatous lesion in the left colon
Adenomas	94
Adenoma detection rate1	13%
Advanced adenomas	18
Advanced adenoma deletion rate	17 (3)
Simultaneous detection of lesions
(Cases with at least one adenoma in both right and left colon)
Adenomas	22 (4)
Advanced adenomas	0

¹Detection rates were defined as number of colonoscopies in which one or more lesion was found divided by the number of colonoscopies performed.