Table 5. Unadjusted and adjusted ^* association of factors with adenoma detection rate.

	Low ADR	High ADR	Unadjusted		Adjusted
	N	N	OR (95 % CI)	P value	OR (95 % CI)	P value
Patient characteristics
Age	11,372	69,543	1.000 (0.997, 1.002)	0.677	1.005 (1.002, 1.007)	< 0.001
Gender
Female	6,854	36,790	1.000 (ref)		1.000 (ref)
Male	4,517	32,751	1.351 (1.297, 1.406)	< 0.001	1.485 (1.421, 1.553)	< 0.001
Physician characteristics
Age	11,372	68,639	0.896 (0.894, 0.898)	< 0.001	0.893 (0.891, 0.895)	< 0.001
Procedure characteristics
Withdrawal time
< 6 mins	215	896	1.000 (ref)		1.000 (ref)
≥ 6 mins	10,771	66,356	1.478 (1.272, 1.718)	< 0.001	1.390 (1.176, 1.644)	< 0.001

ADR, adenomas per colonoscopy for each physician; N, sample size; OR, odds ratio; CI, confidence interval.

^*Adjusted logistic regression adjusted for patient age, patient gender, physician age, and withdrawal time. The number of colonoscopies for adjusted multivariable is 77,357.