Table 3 .

| System usability scale

Question	Average scorea (M ± SD)
1.I think I would like to use this app frequently	1.50 ± 1.29
2.I found the app unnecessarily complexb	2.75 ± 0.96
3.I thought the app was easy to use	3.50 ± 0.58
4.I think that I would need the support of a technical person to be able to use this appb	3.75 ± 0.50
5.I found the various functions in this app were well integrated	3.50 ± 0.58
6.I thought there was too much inconsistency in this appb	3.50 ± 0.58
7.I would imagine that most people would learn to use this app very quickly	3.50 ± 0.58
8.I found the app very cumbersome to useb	3.50 ± 0.58
9.I felt very confident using this app	3.25 ± 0.96
10.I needed to learn a lot of things before I could start using this appb	3.50 ± 0.58

^aEach item scored on five-point Likert scale, 1 = lowest and 5 = highest.

^bItems Q2, Q4, Q6, Q8, and Q10 are worded reversely and were recoded for consistency using the equation: 5-original score.