Table 6.
Point-biserial correlation analysis between the System Usability Scale (SUS) scores and product functions (N=388).
| Product function | Point-biserial correlation | |
|
|
r | P value |
| Activity type identification | .11 | .02 |
| Expandable new features | −.11 | .02 |
| Floor climbing | .03 | .58 |
| Running track | −.04 | .40 |
| Professional fitness record | −.09 | .08 |
| Heart rate | −.09 | .07 |
| Sleep monitoring | .09 | .07 |
| Diet record | .04 | .45 |
| Inactivity notification | .01 | .81 |
| Incoming call alert | .01 | .85 |
| Text message display | −.06 | .22 |
| Time display | −.06 | .22 |
| Remote control photograph | −.05 | .35 |
| Sports achievement sharing | .04 | .40 |
| Bluetooth synchronization | .08 | .13 |