Supplementary Table S2 a. Stratified analysis and multivariate analysis with general linear models. Model 1 Stratified analysis.

Strata	Comparison	Difference in the score (11 items)	95 %CI		P value
			Lower limit	Upper limit
Expert	CL – RS	1.35	0.80	1.89	< 0.001
Supervisor	CL – RS	1.11	0.51	1.71	0.001
				P interaction value	0.518

CI, confidence interval; Expert: RS < 500 and CL < 250; Supervisor: RS ≥ 500 and CL ≥ 250.