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Correlation matrix of user perceptions.
| User perceptiona | 1 | 2 | 3 | 4 |
| 1. Efficiency | - | .55 | .52 | .56 |
| 2. Effectiveness | - | .63 | .68 | |
| 3. Enjoyment | - | .66 | ||
| 4. Active trust | - |
a Pearson correlation coefficient has been used as a measure of correlation between user perceptions. All correlation coefficients were significant (P < .001).
