Table 4.

Mediation analyses (main study)

Detailedness	Mediator	Response	a (IV ➔ MV)			b (MV ➔ DV)			c (IV ➔ DV)			c’ (IV ➔ DV)			a*b
			b	t	p	b	t	p	b	t	p	b	t	p	b	LLCI	ULCI
Detailed	Perceived comprehensiveness	Image	−.402	−2.216	.029	.415	4.741	<.001	−.362	−2.009	.047	−.195	−1.160	.249	−.167	−.372	−.017 *
		Purchase Intention				.257	2.617	.010	−.442	−2.334	.021	−.339	−1.796	.075	−.103	−.265	.005 †
	Perceived credibility	Image	−.218	−1.237	.219	.406	4.464	<.001	−.362	−2.009	.047	−.273	−1.634	.105	−.089	−.246	.054
		Purchase Intention				.295	2.948	.004	−.442	−2.334	.021	−.377	−2.049	.043	−.063	−.182	.040
	Perceived complexity	Image	−.516	−2.736	.007	−.022	−.236	.814	−.362	−2.009	.047	−.373	−1.994	.049	.011	−.097	.149
		Purchase Intention				−.064	−.658	.512	−.442	−2.334	.021	−.475	−2.419	.017	.033	−.077	.177
	Perceived user friendliness	Image	.170	.405	.405	.317	4.182	<.001	−.362	−2.009	.047	−.397	−2.489	.014	.057	−.073	.199
		Purchase Intention				.352	4.310	<.001	−.442	−2.334	.021	−.492	−2.858	.005	.061	−.076	.216
Nondetailed	Perceived comprehensiveness	Image	−.298	−1.722	.088	.197	1.760	.081	.295	1.467	.145	.353	1.752	.083	−.059	−.189	.025
		Purchase Intention				.248	2.273	.025	.299	1.506	.135	.373	1.891	.061	−.074	−.183	.017
	Perceived credibility	Image	.378	2.083	.040	.587	6.379	<.001	.295	1.467	.145	.073	.416	.678	.222	.032	.436 *
		Purchase Intention				.272	2.625	.010	.299	1.506	.135	.196	.993	.323	.103	.005	.246 *
	Perceived complexity	Image	−.062	−.362	.718	−.232	2.190	.031	.295	1.467	.145	.279	1.415	.160	.015	−.070	.140
		Purchase Intention				−.043	−.380	.705	.299	1.506	.135	.296	1.485	.141	.003	−.044	.056
	Perceived user friendliness	Image	.512	3.100	.002	.232	2.089	.039	..295	1.467	.145	.161	.821	.413	.125	−.010	.334 †
		Purchase Intention				.119	1.039	.301	.299	1.506	.135	.231	1.141	.257	.062	−.063	.214

Mediation analyses with PROCESS (model 4, each mediator tested separately), b = unstandardized coefficients; all variables centralized, IV = controllability. Included control variables: gender, age, device experience, product category knowledge, sustainability attitude. a: regression of the mediator on controllability in a single linear regression analysis; b: regression of DV on the mediator in a multiple regression analysis; c: regression of DV on controllability in a single linear regression analysis; c’: regression of DV on controllability in a multiple regression analysis; a*b: indirect effect; *Bootstrapping (CI-95%, 5000 samples): LLCI: lower limit, ULCI: upper limit. †Bootstrapping with CI-90% applied to test for the p < .10-level