Table 2.
Means and standard deviation scores for the System Usability Scale
| Questionsa | Upper arm (n = 25) | Finger prick (n = 25) | P value |
|---|---|---|---|
| I think I would like to use the system frequently, mean ± SD | 4.0 ± 1.1 | 3.6 ± 1.5 | 0.30 |
| I found the system to be unnecessarily complex | 1.3 ± 0.6 | 1.9 ± 1.3 | 0.06 |
| I thought the system was easy to use | 4.0 ± 1.3 | 4.2 ± 1.2 | 0.46 |
| I think that I would need support of a technical person to be able to use the system | 1.6 ± 1.2 | 1.6 ± 1.2 | 0.61 |
| I found the various functions in the system were well integrated | 4.5 ± 1.0 | 4.0 ± 1.2 | 0.07 |
| I thought there was too much inconsistency in the system | 1.8 ± 1.4 | 1.7 ± 1.3 | 0.78 |
| I would imagine that most people would learn to use the system very quickly | 4.3 ± 1.0 | 4.3 ± 1.1 | 0.54 |
| I found the system very cumbersome to use | 1.7 ± 1.1 | 1.7 ± 1.3 | 0.87 |
| I felt very confident using the system | 4.3 ± 0.8 | 4.3 ± 1.2 | 0.35 |
| I needed to learn a lot of things before I could get going with the system | 1.4 ± 0.7 | 1.3 ± 0.7 | 0.16 |
| System Usability Scale total score (out of 100) | 83.1 ± 13.9 | 80.7 ± 20.5 | 0.98 |
aResponses were scored on a 5-point Likert scale: 1=strongly disagree, 5=strongly agree