Table 1.
Mean scores, distribution and floor and ceiling effects, by rater and subscale
| Scale | Skewness | Mean (SD) | Floor effect, % | Ceiling effect, % | ||||
|---|---|---|---|---|---|---|---|---|
| Rater 1 | Rater 2 | Rater 1 | Rater 2 | Rater 1 | Rater 2 | Rater 1 | Rater 2 | |
| Engagement | 0.39 | 0.17 | 2.87 (0.87) | 2.96 (0.79) | 0 | 0 | 2.3 | 0 |
| Functionality | −0.28 | −0.87 | 4.10 (0.67) | 4.15 (0.80) | 0 | 0 | 18.6 | 18.6 |
| Aesthetics | −0.67 | −0.56 | 3.34 (0.99) | 3.34 (0.94) | 7.0 | 4.7 | 4.7 | 2.3 |
| Informationa | −0.64 | −0.34 | 3.49 (0.80) | 3.48 (0.72) | 0 | 0 | 0 | 0 |
| MARS total score | −0.36 | −0.34 | 3.45 (0.66) | 3.48 (0.66) | 0 | 0 | 0 | 0 |
| Subjective quality | 0.39 | 0.51 | 2.49 (1.17) | 2.31 (0.99) | 7.0 | 14.0 | 2.3 | 0 |
a Item 19 was excluded from all calculations because of lack of ratings