Table 4.
Percentage error between visually counted steps and steps from each monitor.
| Device | % Error, mean (95% CI)a | % Error, minimum, maximum (range) | ≥ 5% Error, n (%) | ≥10% Error, n (%) | ≥25% Error, n (%) |
|---|---|---|---|---|---|
| Fitbit Alta | −80.6 (−113.0, −48.3) | −216.7, 48.3 (265.0) |
19 (100) | 18 (95) | 18 (95) |
| Fitbit Zip | −14.9 (−47.0, 17.2) | −151.6, 82.8 (234.4) |
17 (89) | 14 (74) | 8 (42) |
| Garmin Vivofit 4 | −67.6 (−90.9, −44.2) | −168.4, 28.8 (197.2) |
18 (95) | 18 (95) | 16 (84) |
| Yamax SW200 | 12.1 (−5.2, 29.4) | −79.5, 93.7 (173.2) |
16 (84) | 13 (68) | 7 (37) |
| Letscom | −112.3 (−148,8, −75.9) | −318.8, 32.7 (351.5) |
19 (100) | 19 (100) | 18 (95) |
| activPAL3μb | 59.0 (56.6, 61.3) | 54.2, 70.3 (16.1) |
19 (100) | 19 (100) | 19 (100) |
a
Positive value indicates the device underestimates steps in comparison to manual count.
b
n = 16.