BMC Health Services Research

Table 4 Test results for control variables

From: What drives the adoption of online health communities? An empirical study from patient-centric perspective

Variables	R ²		Control variable effect
	With control variable	Without control variable	ΔR^2a	f ^2b	Effect
Behavioral intention	0.175	0.172	0.003	0.003	insignificant
Usage behavior	0.161	0.159	0.002	0.002	insignificant

Note: ^aΔR²: R²_{with control variables} – R²_{without control variables}; ^bƒ²: Cohen ƒ²

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ISSN: 1472-6963

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