Machine learning better predicts colonoscopy duration

Table 1 Cohort background characteristics

Demographic information
Total patients	40168
Mean age	58.95
Sex	Female	17682
	Male	22485 (56.0%)
ASA Class	I	7071
	II	27699
	III	5237
	IV	158
	V	3
Race	Caucasian	32031
	Hispanic	2219
	Black	2193
	Asian	1140
	Native American	679
	Other	1906
Procedural information
Median procedure year	2012	(2008-2014)
Total No. of sites	75
Fellow involved	3575
Indication for procedure	Average risk screening	12687
	Surveillance of adenomatous polyps	8213
	Hematochezia	3795
	High risk screening	3272
	Anemia	1508
	Diarrhea	1469
	Other	9224
Procedure order	1st	37864
	2nd	2056
	Other	248
Mean duration of procedure	23.4 min
Depth intended	Cecum	31745
	Terminal Ileum	6798
	Ascending colon	570
	Ileum	424
	Anastomosis site	447
	Other	163
Location of the procedure	Hospital endoscopy suite	15589
	Ambulatory surgery center	14730
	unknown	5739
	Office	2501
	Endoscopy suite	1450
	ICU	88
Region	North Central	3490
	Northeast	11156
	Northwest	12329
	South Central	776
	South East	1466
	South West	10947
Site type	Community	25133
	HMO	1000
	University	5676
	VA	8359
Sedation	None	241
	Moderate/Conscious sedation	28009
	“Deep” Sedation	7289
	General Anesthesia	2510
	Anxiolytic Sedation	78
Provider information
Gender of provider	Female	9881
	Male	30287
Median degree year of provider	1989	(1962-2009)
Degree of performing provider	DO	1253
	MD	38851
	PA	64
Provider specialty	Gastroenterology	33059
	Surgery	2976
	Colorectal surgery	995
	Internal medicine	1589
	Family medicine	581
	Other	968
Ethnicity of provider	Hispanic	419
	Non-hispanic	37148

ICU: Intensive care unit; HMO: Health maintenance organization.