Establishing a model to measure and predict the quality of gastrointestinal endoscopy

Table 1 Description of outcome variables and predictor variables

	Individual endoscopist-related	Endoscopy division-related
Outcome variable	Occurrence of medical malpractice and patient disturbance	Incidence of endoscopic complications
Predictor variable	Length of experience in endoscopy	Length of experience in endoscopy
	Workload (weekly working hours)	Ratio of endoscopists to nurses
	Workload (weekly night shifts)
	Workload (annual vacation days)
	Job satisfaction
	Endoscopist status (part- or full-time)

Table 2 Results of multivariable logistic regression analysis for occurrence of medical malpractice and patient disturbance

Impact factors	OR (95%CI)	P value
Length of experience in endoscopy	0.77 (0.75-0.78)	< 0.0001
Workload as weekly working hours	0.90 (0.86-0.94)	< 0.0001
Workload as weekly night shifts	0.96 (0.92-0.99)	0.0132
Workload as annual vacation days	1.02 (1.0-1.03)	0.0178
Job satisfaction	2.24 (2.12-2.36)	< 0.0001

Table 3 Results of regression analysis for incidence of endoscopic retrograde cholangiopancreatography-related complications

Impact factors	Linear regression analysis		Nonlinear (root) regression analysis		Nonlinear (square) regression analysis		Nonlinear (log) regression analysis
	Coefficient	P value	Coefficient	P value	Coefficient	P value	Coefficient	P value
Intercept	0.0326	0.0000	0.0343	0.0022	0.0312	0.0000	0.0222	0.0888
Length of experience in endoscopy	0.0000	0.9895	0.0007	0.7124	-0.0000	0.5579	0.0029	0.4635
Ratio of endoscopists to nurses	-0.0018	0.1499	-0.0065	0.1307	-0.0001	0.3407	-0.0048	0.1389

Table 4 Results of regression analysis for incidence of gastroscopy/colonoscopy-related complications

Impact factor	Linear regression analysis		Nonlinear (root) regression analysis		Nonlinear (square) regression analysis		Nonlinear (log) regression analysis
	Coefficient	P value	Coefficient	P value	Coefficient	P value	Coefficient	P value
Intercept	0.0064	0.0000	0.0075	0.0057	0.0059	0.0000	0.0070	0.0173
Length of experience in endoscopy	-0.0000	0.4461	-0.0003	0.5274	-0.0000	0.4250	-0.0006	0.5821
Ratio of endoscopists to nurses	-0.0000	0.8001	-0.0005	0.6422	-0.0000	0.8793	-0.0002	0.8611