Table 3 System usability scale (SUS). The SUS scores range from 1 (“strongly disagree”) to 5 (“strongly agree”)
Questionnaire Item | Subject 1 | Subject 2 | Subject 3 | Subject 4 | Subject 5 | Subject 6 | Subject 7 |
|---|---|---|---|---|---|---|---|
I think that I would like to use this system frequently | 5 | 5 | 5 | 4 | 3 | 5 | 4 |
I found the system unnecessarily complex. | 4 | 1 | 1 | 2 | 2 | 2 | 2 |
I thought the system was easy to use. | 5 | 5 | 4 | 4 | 5 | 5 | 4 |
I think that I would need the support of a technician to use the system. | 3 | 4 | 5 | 1 | 4 | 5 | 4 |
I found the various functions in this system were well integrated. | 5 | 5 | 5 | 4 | 4 | 5 | 2 |
I thought there was too much inconsistency in this system. | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
I imagine that most people would learn to use this system very quickly. | 4 | 5 | 5 | 5 | 5 | 5 | 4 |
I found the system very cumbersome to use. | 1 | 1 | 1 | 1 | 1 | 2 | 2 |
I felt very confident using the system. | 5 | 5 | 4 | 5 | 4 | 5 | 4 |
I needed to learn a lot of things before I could get going with this system. | 4 | 3 | 4 | 1 | 1 | 5 | 1 |
SUS score | 77.5 | 87.5 | 77.5 | 82.5 | 77.5 | 77.5 | 77.5 |