Table 2. Summative usability test results.
| Original user interface | Redesigned user interface | p -Value | |
|---|---|---|---|
| Identification of overdue screens | |||
| Mean clicks a | 0.10 | 1.17 | 0.007 |
| Mean cursor movement (pixels) | 996 | 891 | NS |
| Mean task time (s) a | 8.3 | 6.0 | 0.001 |
| Mean error rate (#/task) a | 0.83 | 0.10 | <0.0001 |
| Single ease question | 4.91 | 4.96 | NS |
| Depression screening | |||
| Mean clicks | 4.5 | 4.4 | NS |
| Mean cursor movement (pixels) | 4,269 | 3,097 | NS |
| Mean task time (s) a | 13.5 | 7.9 | 0.005 |
| Mean error rate (#/task) a | 0.75 | 0.17 | 0.027 |
| Single ease question | 5.00 | 5.00 | N/A |
| Alcohol and drug misuse screen | |||
| Mean clicks | 4.0 | 3.1 | NS |
| Mean cursor movement (pixels) | 3,915 | 2,564 | NS |
| Mean task time (s) a | 13.5 | 7.5 | 0.027 |
| Mean error rate (#/task) | 0.27 | 0.18 | NS |
| Single ease question | 4.83 | 5.00 | NS |
| Fall risk screen | |||
| Mean clicks | 3.9 | 4.3 | NS |
| Mean cursor movement (pixels) a | 3,364 | 2,231 | 0.045 |
| Mean task time (s) a | 15.6 | 9.6 | 0.0045 |
| Mean error rate (#/task) | 0.25 | 0.00 | NS |
| Single ease question | 4.75 | 5.00 | NS |
| Deferrals | |||
| Mean clicks | 8.4 | 8.8 | NS |
| Mean cursor movement (pixels) | 7,384 | 4,746 | NS |
| Mean task time (s) a | 32.8 | 12.9 | 0.035 |
| Mean error rate (#/ptask) | 0.27 | 0.09 | NS |
| Single ease question a | 3.81 | 4.91 | 0.045 |
| System usability scale a | 80.8 | 96.9 | 0.021 |
Abbreviations: NS, not significant; N/A, not applicable.
Note: This table shows a comparison of original user interface versus the redesigned prototype user interface.
a
p < 0.05.