Multicenter randomised controlled trial comparing the high definition white light endoscopy and the bright narrow band imaging for colon polyps

Table 1 Characteristics of patients and colonoscopy performance in both groups n (%)

Parameters	bNBI (n = 495)	WLE (n = 511)	P value
Patients
Men	210 (42.43)	237 (46.38)	0.207
Age, mean ± SD	58.31 ± 6.17	58.36 ± 6.13	0.904
BMI, mean ± SD	23.75 ± 3.29	23.74 ± 2.99	0.942
Current smoker	24 (4.9)	29 (5.7)	0.536
Current drinker	38 (7.7)	44 (8.7)	0.815
Current use of NSAID	6 (1.2)	9 (1.8)	0.705
Current use of aspirin	13 (2.6)	22 (4.3)	0.345
Current use of warfarin	0	2 (0.4)	0.232
Comorbidities
Hypertension	123 (24.8)	131 (25.6)	0.774
Diabetes	56 (11.3)	32 (6.3)	0.005
Ischemic heart disease	10 (2.0)	10 (2.0)	0.943
Chronic obstructive airway disease	2 (0.4)	0	0.15
Previous stroke	1 (0.2)	2 (0.4)	0.582
Cirrhosis	1 (0.2)	1 (0.2)	0.982
Gastro-esophageal reflux	10 (2)	8 (1.6)	0.587
Dyslipidemia	31 (6.3)	29 (5.7)	0.694
History of cancer	19 (3.8)	12 (2.3)	0.172
Examination time (min), mean ± SD
Time to cecum	6.66 ± 4.56	7.06 ± 4.94	0.183
Time for withdrawal	11.23 ± 6.36	9.84 ± 5.03	< 0.0001

bNBI: Bright narrow band imaging; WLE: White light endoscopy.