Table 2.

Test-retest reliability of the user version of the Mobile App Rating Scale (95% CI).

Subscale/item		1- to 2-month period (N=113)	3-month period (N=74)
Engagement		.71 (.66-.76)	.73 (.67-.78)
1	Entertainment	.60 (.41-.72)	.75 (.61-.85)
2	Interest	.69 (.55-.79)	.67 (.48-.79)
3	Customization	.61 (.44-.73)	.53 (.25-.70)
4	Interactivity	.55 (.35-.69)	.69 (.51-.81)
5	Target group	.72 (.59-.80)	.73 (.57-.83)
Functionality		.62 (.54-.68)	.69 (.61-.76)
6	Performance	.54 (.34-.69)	.71 (.53-.81)
7	Ease of use	.65 (.49-.76)	.72 (.55-.82)
8	Navigation	.62 (.45-.74)	.67 (.48-.79)
9	Gestural design	.61 (.44-.73)	.65 (.44-.78)
Aesthetics		.58 (.48-.66)	.68 (.59-.76)
10	Layout	.39 (.11-.58)	.48 (.18-.67)
11	Graphics	.70 (.56-.79)	.77 (.63-.85)
12	Visual appeal	.63 (.46-.75)	.80 (.68-.87)
Information		.48 (.38-.57)	.52 (.40-.62)
13	Quality of information	.48 (.24-.64)	.44 (.11-.65)
14	Quantity of information	.48 (.24-.64)	.32 (.08 to .57)
15	Visual information	.42 (.16-.60)	.75 (.61-.84)
16	Credibility of source	.51 (.29-.66)	.63 (.41-.77)
Total uMARSa		.66 (.63-.68)	.70 (.67-.78)
Subjective items		.70 (.64-.75)	.71 (.64-.77)
17	Would you recommend	.84 (.76-.89)	.75 (.60-.84)
18	How many times	.44 (.18-.61)	.48 (.17-.67)
19	Would you pay	.81 (.73-.87)	.82 (.71-.89)
20	Overall (star) rating	.71 (.59-.80)	.77 (.63-.85)

^a uMARS: user version of the Mobile App Rating Scale.