Table 3.
Descriptive statistics for reported agreement with ease of use for the Netra device (n=50 subjects).
| Ease of Use Survey Item | Mean* | SD | Min | Max | Median | P** |
|---|---|---|---|---|---|---|
| I think that I would like to use this device frequently | 3.42 | 1.18 | 1 | 5 | 3.0 | .60 |
| I found this device was unnecessarily complex | 1.70 | 1.16 | 1 | 5 | 1.0 | .80 |
| I thought this device was easy to use | 4.22 | 1.23 | 1 | 5 | 5.0 | .44 |
| I think that I would need the support of a technical person to be able to use this device | 2.34 | 1.36 | 1 | 5 | 2.0 | .81 |
| I found the various functions in this device were well integrated | 4.00 | 1.16 | 1 | 5 | 4.0 | .70 |
| I thought there was too much inconsistency in this device | 2.00 | 1.28 | 1 | 5 | 1.0 | .25 |
| I would imagine that most people would learn to use this device very quickly | 4.22 | 0.97 | 1 | 5 | 4.0 | .19 |
| I found this device very cumbersome to use | 2.04 | 1.18 | 1 | 5 | 2.0 | .16 |
| I felt very confident using this device | 4.12 | 1.06 | 1 | 5 | 4.0 | .33 |
| I needed to learn a lot of things before I could get going with this device | 1.76 | 1.20 | 1 | 5 | 1.0 | .81 |
| Netra SUS Score | 75.35 | 19.83 | 15 | 100 | 80.0 | .78 |
SD = Standard Deviation; SUS = System Usability Scale
*
Mean (and other descriptive statistics) response for the 10 ease of use survey items based on the original Likert scale: strongly disagree (1) to strongly agree (5)
**
Two-sample Wilcoxon test to compare Netra scores between subjects <65 years old and ≥65 years old