Table 3.
Item scores on the System Usability Scale.
| Item (8/10 original questions)a | Response scores across participants | ||||||
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|
A | B | C | D | E | F | |
| Higher is better |
|
|
|
|
|
|
|
|
|
Use it frequently | 4 | 3 | 5 | —b | 5 | 4 |
|
|
Easy to use | 4 | 1 | 1 | — | 5 | 5 |
|
|
Functions integrated | 5 | 1 | 3 | — | 1 | — |
|
|
Confidence in using | 5 | 1 | — | — | 1 | 4 |
| Lower is better |
|
|
|
|
|
|
|
|
|
Too complex | 1 | 1 | 1 | — | 1 | 1 |
|
|
Need assistance to use | 1 | 1 | 1 | — | 1 | 1 |
|
|
Cumbersome or awkward | 1 | 1 | 5 | — | 2 | 1 |
|
|
Need to learn a lot before using | 1 | 5 | 1 | — | 2 | 5 |
aTwo questions were omitted because of understanding (too much inconsistency with sensor) and applying what other people might think (I would imagine most people would learn to use this very quickly). Of the 18-item responses for the four questions where higher is better, 10 were at the two highest agreement levels and 6 were at the lowest levels. Of the 20-item responses for four items where lower is better, 15 were at the best level and 3 were at the poorest level.
bNot available.