Table 2.

Multivariable linear regression analysis of surgeon factors associated with explicit preference for specific disease over nonspecific illness^a

Variable	Regression coefficient (95% CI)	Partial r2	p value
Practice location
Others	Reference value
United States	-36 (-60 to -12)	0.09	0.003
Europe	-23 (-48 to 2)	0.034	0.07
Supervising trainees
No	Reference value
Yes	16 (-6 to 38)	0.02	0.15

^aThe adjusted r-squared value for the model was 0.092, which reflects the amount of variation in explicit preference accounted for by the entire model.

Partial r-squared is a measure of the variation in explicit preference accounted for by that variable; a partial r-squared of 0.09 means 9% is accounted for.