Table 4.

Multivariate coefficient of determination (R²) results.

Variables		R 2		Control variable effects
		In	Out	∆R2a	ƒ b	Effects
Physician-patient communication
	Control variables	0.722	0.720	0.002	0.007	Insignificant
	eHealth literacy	0.677	0.004	0.673	2.084	Large
Internet health information–seeking behavior
	Control variables	0.537	0.534	0.003	0.006	Insignificant
	eHealth literacy	0.537	0.003	0.534	1.153	Large
Perceived quality of internet health information
	Control variables	0.677	0.676	0.001	0.003	Insignificant
	eHealth literacy	0.677	0.002	0.675	2.090	Large
Patient adherence
	Control variables	0.617	0.613	0.004	0.010	Insignificant
	Physician-patient communication	0.617	0.571	0.046	0.120	Small
	Internet health information–seeking behavior	0.617	0.608	0.009	0.023	Small
	Perceived quality of internet health information	0.617	0.604	0.013	0.034	Small

^a∆R²: R²_In – R²_Out.

^bƒ²: Cohen ƒ².