Table 3.
Means and standard deviation scores for the System Usability Scale.
| Questionsa | Tablet owners | Tablet nonowners | All |
| I think I would like to use the app frequently | 4.22 (0.67) | 4.00 (1.05) | 4.11 (0.88) |
| I found the system to be unnecessarily complex | 1.33 (0.50) | 1.40 (0.52) | 1.37 (0.50) |
| I thought the system was easy to use | 4.22 (1.30) | 4.40 (0.97) | 4.32 (1.11) |
| I think that I would need support of a technical person to be able to use the system | 1.67 (0.87) | 1.60 (0.84) | 1.63 (0.83) |
| I found the various functions in the system were well integrated | 4.22 (0.44) | 4.10 (0.99) | 4.16 (0.77) |
| I thought there was too much inconsistency in the system | 2.00 (1.10) | 1.50 (0.53) | 1.74 (0.81) |
| I would imagine that most people would learn to use the system very quickly | 4.56 (0.53) | 4.30 (0.68) | 4.42 (0.61) |
| I found the system very cumbersome to use | 1.11 (0.33) | 1.30 (0.48) | 1.21 (0.42) |
| I felt very confident using the system | 4.67 (0.50) | 4.80 (0.42) | 4.74 (0.45) |
| I needed to learn a lot of things before I could get going with the system | 1.56 (0.73) | 1.60 (1.27) | 1.58 (1.02) |
| System Usability Scale total score (out of 100) | 85.6 (7.6) | 85.5 (11.8) | 85.5 (9.8) |
aResponses were scored on a 5-point Likert scale: 1=strongly disagree, 5=strongly agree.