Table 4.
Percentage Accuracy of Activity Monitors Stratified by Gait Speed Category.
| Activity monitor | <0.6 m/s M (SD) n = 7 |
0.60-0.79 m/s M (SD) n = 12 |
0.8-1.0 m/s M (SD) n = 11 |
>1.0 m/s M (SD) n = 13 |
p value |
|---|---|---|---|---|---|
| Actigraph GT3X | 14.1 (18.6) | 35.6 (31.2) | 52.7 (28.6) | 85.1 (20.5) | <.0001 |
| ActivPAL | 86.8 (14.0) | 91.8 (15.1) | 98.2 (0.8) | 95.1 (9.2) | .0174 |
| StepWatch | 99.4 (0.6) | 98.2 (2.5) | 99.7 (0.3) | 99.0 (0.9) | .0208 |
Note. Accuracy defined as monitor steps/observed steps × 100 with 100% indicating perfect accuracy.