Table 4.

Results of multilevel logistic regression analysis for assessing the interendoscopist variability

			Coefficient (standard error)	P value	OR	95%CI
Adenoma detection rate	Patient level	Constant	-2.37 (0.356)	< 0.0001
		Age	0.036 (0.006)	< 0.0001	1.037	1.025-1.048
		Gender (ref = male)	-1.019 (0.082)	< 0.0001	0.361	0.308-0.424
	Endoscopist level	σ2u01	0.070 (0.032)	0.03
Distal adenoma detection rate	Patient level	Constant	-2.498 (0.369)	< 0.0001
		Age	0.033 (0.006)	< 0.0001	1.033	1.022-1.045
		Gender (ref = male)	-0.932 (0.085)	< 0.0001	0.394	0.333-0.466
	Endoscopist level	σ2u01	0.044 (0.025)	0.08
Proximal adenoma detection rate	Patient level	Constant	-4.169 (0.538)	< 0.0001
		Age	0.041 (0.008)	< 0.0001	1.042	1.025-1.059
		Gender (ref = male)	-1.065 (0.127)	< 0.0001	0.345	0.269-0.442
	Endoscopist level	σ2u01	0.234 (0.101)	0.02
Proximal serrated polyp detection rate	Patient level	Constant	-4.049 (0.677)
		Age	0.025 (0.010)	0.02	1.025	1.004-1.046
		Gender (ref = male)	-0.498 (0.150)	< 0.001	0.608	0.453-0.816
	Endoscopist level	σ2u01	0.460 (0.199)	0.02

¹Variance of the endoscopist-level random effect representing the heterogeneity between endoscopists in terms of the outcome.