Table 5 Usability measures: system usability scale and utility, satisfaction, ease of use and ease of learning questionnaire

System Usability Scale (n = 8)

 I think that I would like to use this system frequently

4.00

2–5

1.19

 I found the system unnecessarily complex

1.88

1–4

1.24

 I thought the system was easy to use

4.75

3–5

0.70

 I think that I would need the support of a technical person to be able to use this system

1.13

1–2

0.35

 I found the various functions in this system were well integrated

4.88

4–5

0.35

 I thought there was too much inconsistency in this system

1.00

1–1

0

 I would imagine that most people would learn to use this system very quickly

4.63

3–5

0.74

 I found the system very cumbersome to use

1.25

1–3

0.70

 I felt very confident using the system

4.88

4–5

0.35

 I needed to learn a lot of things before I could get going with this system

2.25

1–5

1.83

Utility, Satisfaction, Ease of Use and Ease of Learning Questionnaire (n = 8)

 On a scale from 0 to 10, in your opinion, indicate the general utility of the “ + Adesão!” app (0 useless–10 very useful)

9.63

9–10

0.51

 On a scale from 0 to 10, in your opinion, indicate your general satisfaction with the “ + Adesão!” app (0 dissatisfied–10 totally satisfied)

9.50

8–10

0.75

 On a scale from 0 to 10, in your opinion, how easy was it generally to use the “ + Adesão!” app? (0 difficult to use–10 very easy to use)

9.88

9–10

0.35

 On a scale from 0 to 10, in your opinion, how easy was it generally to understand and learn to use the “ + Adesão!” app? (0 difficult to learn to use–10 very easy to learn to use)

9.75

9–10

0.46