Table 2.
Usability ratings of Ada and Rheport using the System Usability Scales (SUS).
| Ada | Rheport | |||||
|---|---|---|---|---|---|---|
| SUS Item | Mean (SD) | Mean trimmed (95% CI) | Mean (SD) | Mean trimmed (95% CI) | ξa | P-Valueb |
| 1-I think I would like to use the system frequently | 1.9 (1.3) | 2.0 (1.8–2.1) | 2.1 (1.2) | 2.2 (2.1–2.3) | 0.10 | 0.0004 |
| 2-I found the system to be unnecessarily complex | 3.1 (1.1) | 3.3 (3.2–3.5) | 3.2 (1.0) | 3.4 (3.3–3.6) | 0.05 | 0.0749 |
| 3-I thought the system was easy to use | 3.2 (1.1) | 3.6 (3.6–3.7) | 3.3 (1.1) | 3.7 (3.6–3.7) | 0.04 | 0.1740 |
| 4-I think that I would need support of a technical person to be able to use the system | 3.3 (1.2) | 3.8 (3.8–3.9) | 3.4 (1.1) | 3.9 (3.8–3.9) | 0.03 | 0.1581 |
| 5-I found the various functions in the system were well integrated | 2.6 (1.1) | 2.7 (2.6–2.8) | 2.9 (1.0) | 2.9 (2.8–3.0) | 0.11 | 0.0003 |
| 6-I thought there was too much inconsistency in the system | 2.6 (1.0) | 2.5 (2.4–2.6) | 2.7 (1.0) | 2.7 (2.6–2.8) | 0.09 | 0.0009 |
| 7-I would imagine that most people would learn to use the system very quickly | 3.1 (1.1) | 3.3 (3.2–3.4) | 3.1 (1.1) | 3.4 (3.3–3.6) | 0.06 | 0.0220 |
| 8-I found the system very cumbersome to use | 3.4 (1.0) | 3.7 (3.7–3.8) | 3.4 (0.9) | 3.8 (3.7–3.8) | 0.03 | 0.3623 |
| 9-I felt very confident using the system | 3.0 (1.1) | 3.3 (3.2–3.4) | 3.2 (1.1) | 3.5 (3.3–3.6) | 0.10 | 0.0003 |
| 10-I needed to learn a lot of things before I could get going with the system | 3.5 (1.0) | 3.9 (3.9–4.0) | 3.6 (0.9) | 4.0 (3.9–4.0) | 0.01 | 0.7859 |
| Total Score (100) | 74.4 (16.8) | 76.7 (75.3–78.2) | 77.1 (16.0) | 79.3 (78.0–80.6) | 0.11 | 0.0000 |
a
ξ, explanatory measure of effect size;
b
Yuen's test on trimmed means for dependent samples. Bold values indicate the at least small effect size and statistically significant.