Table 5. Examination of the combined effects of all possible factors that are thought to be determinative in estimating the total procedure time and the change in the total number of detected polyps – results of multivariate linear regression analysis.

Group 1: One operator sitting (1op-sit), Group 2: One operator standing (1op-sta), Group 3: Two operators standing (2op-sta). The R square value of the model for the total processing time was 8.1%, and the R square value of the number of polyps was 8.3%.

	Regression coefficient	95% Confidence interval	t-statistics	p-value
Total processing time
Age	0.006	0.002–0.010	3.204	0.002
Female sex	-0.031	-0.130–0.069	-0.610	0.543
Additional features	0.099	-0.080–0.278	1.094	0.275
Group 1	-0.712	-0.833 – -0.591	-11.572	<0.001
Group 3	-0.343	-0.467 – -0.220	-5.472	<0.001
Total number of polyps detected
Age	0.007	0.002–0.012	2.972	0.003
Female sex	-0.204	-0.328 – -0.080	-3.247	<0.001
Additional features	-0.083	-0.306–0.141	-0.729	0.467
Group 1	-0.217	-0.369 – -0.066	-2.830	0.005
Group 3	-0.172	-0.326 – -0.017	-2.193	0.029