Table 6.
Errors in step count estimation when compared with the waist-mounted reference, based on the total number of steps for each activity.
| Activity | Mean error, steps | Mean absolute error, steps | Mean percentage error, % | Mean absolute percentage error, % | ||||
|
|
Mean | SD | Mean | SD | Mean | SD | Mean | SD |
| Treadmill (n=27) | −13.0 | 11.5 | 13.4 | 11.1 | −3.7 | 3.4 | 3.9 | 3.2 |
| Treadmill 5% (n=29) | 0.0 | 33.2 | 19.8 | 26.3 | 0.3 | 12.9 | 7.3 | 10.5 |
| Walking (n=28) | −17.6 | 16.9 | 18.0 | 16.4 | −6.5 | 11.0 | 6.6 | 10.9 |
| Running (n=29) | 8.3 | 42.2 | 26.9 | 33.2 | 2.4 | 10.8 | 6.4 | 9.0 |
| All walk activitiesa (n=29) | −21.1 | 55.6 | 47.9 | 34.3 | −1.6 | 4.0 | 3.5 | 2.4 |
aThe last row shows the observed error for the total number of steps of all walking activities.