. 2018 Dec 14;20(12):e11491. doi: 10.2196/11491

Table 3.

Pearson correlations between Enlight scales, publicly available data on program acceptance, and real-world user engagement with eHealth interventions.

Scale		Mobile app interventions (n=52)				Web interventions (n=32)
		Usage time		User 30-day retention		Usage time
		r ^a	P value	r	P value	r	P value
Usability		.15	.14	−.07	.32	.01	.48
	Ease of use	.21	.07	.05	.36	.10	.29
	Learnability	.07	.31	−.13	.18	−.14	.22
	Navigation	.13	.18	−.11	.22	.03	.43
Visual Design		.31^b	.01	.25^b	.04	.09	.32
	Aesthetics	.28^b	.02	.28^b	.02	.12	.26
	Layout	.32^b	.01	.19	.09	.14	.22
	Size	.24^b	.047	.18	.10	−.00	.49
User Engagement		.49^b	<.001	.39^b	.002	.21	.12
	Captivating	.51^b	<.001	.31^b	.01	.38^b	.02
	Content presentation	.53^b	<.001	.29^b	.02	.22	.12
	Interactive	.13	.19	.25^b	.04	.28	.06
	Not irritating	.23	.07	.17	.15	−.11	.31
	Targeted/tailored/personalized	.41^b	.001	.38^b	.003	.01	.48
Content		.45^b	<.001	.33^b	.009	.16	.19
	Evidence-based content	.43^b	.001	.31^b	.01	.15	.20
	Information provision quality	.35^b	.006	.34^b	.006	−.01	.48
	Complete and concise	.39^b	.002	.35^b	.005	.27	.07
	Clarity about program’s purpose	.43^b	.001	.10	.23	.09	.30
Therapeutic Persuasiveness		.36^b	.004	.39^b	.002	.33^b	.03
	Call to action	.34^b	.007	.49^b	<.001	.29	.055
	Load reduction of activities	.44^b	.001	.37^b	.004	.37^b	.02
	Therapeutic rationale/pathway	.47^b	<.001	.36^b	.004	.21	.12
	Rewards	.14	.16	.26^b	.03	.22	.12
	Data-driven/adaptive	.11	.21	.24^b	.046	.23	.10
	Ongoing feedback	.14	.16	.33^b	.01	.14	.23
	Expectations and relevance	.31^b	.01	.03	.41	.19	.15
Therapeutic Alliance		.51^b	<.001	.31^b	.01	.36^b	.02
	Basic acceptance and support	.45^b	<.001	.40^b	.002	.42^b	.009
	Positive therapeutic expectations	.45^b	<.001	.33^b	.009	.22	.12
	Relatability	.40^b	.002	.09	.26	.32^b	.04
Enlight postempirical measures
	Credibility	.34^b	.006	−.03	.42	.31^b	.04
	Research evidence	.08	.28	−.13	.18	.19	.15
Google Store data
	Number of installs	.25^b	.04	.10	.25	N/A^c	N/A
	Average star reviews	.36^b	.005	.18	.11	N/A	N/A
	Number of reviews	.58^b	<.001	.23^b	.049	N/A	N/A
Web traffic data
	Total monthly visits	N/A	N/A	N/A	N/A	.19	.15

^aUsing Fisher Z-transformation, no significant differences in Pearson correlation values were found between programs targeting mental health (mobile apps n=38 and websites n=22) and those targeting health-related behaviors (mobile apps n=14 and websites n=10) or between the full samples and the samples after subtracting paid programs with free trials (n=7).

^bIndicates significant correlations.

^cN/A: not applicable.