Table 4. Unadjusted and adjusted ^* association of factors with adenoma per positive colonoscopy.

	Low APP	High APP	Unadjusted		Adjusted
	N	N	OR (95 % CI)	P value	OR (95 % CI)	P value
Patients characteristics
Age	40,402	40,513	0.998 (0.997, 1.000)	0.036	1.000 (0.998, 1.001)	0.760
Gender
Female	22,160	21,484	1.000 (ref)		1.000 (ref)
Male	18,241	19,027	1.076 (1.047, 1.106)	< 0.001	1.069 (1.039, 1.099)	< 0.001
Physician characteristics
Age	39,912	40,099	0.974 (0.972, 0.975)	< 0.001	0.973 (0.971, 0.974)	< 0.001
Procedure characteristics
Withdrawal time
< 6 mins	794	317	1.000 (ref)		1.000 (ref)
≥ 6 mins	38,526	38,871	2.545 (2.233, 2.901)	< 0.001	2.538 (2.218, 2.902)	< 0.001

APP, 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.