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Summary statistics of the System Usability Scale scores for question 2 (N=65).
| Previously worn an activity tracker? | Participants, n (%) | Mean (SD) | t test (df) | P value |
| Yes | 13 (20) | 72.12 (15.61) | −1.10 (63) | .28 |
| No | 52 (80) | 65.91 (18.81) | −1.10 (63) | .28 |
