Table 4.
Accuracy and precision of sensors and applications in the second trial of walking 500 steps.
| Accuracy |
Precision |
|||||||
|---|---|---|---|---|---|---|---|---|
| Mean | 95% CI | % error | N ≥ 5% error | N ≥ 10% error | N ≥ 25% error | Standard deviation | Coefficient of variation | |
| Digi-Walker SW-200 pedometer (Yamax) | 451.4 | 419.3–483.5 | 9.7 | 13 | 8 | 5 | 106.9 | 0.2 |
| UP2 (Jawbone) | 490.5 | 457.2–523.8 | 1.9 | 15 | 8 | 2 | 110.9 | 0.2 |
| UP Move (Jawbone) | 455.5 | 432.4–478.5 | 8.9 | 21 | 12 | 2 | 76.8 | 0.2 |
| Flex (Fitbit) | 438.1 | 418.0–458.2 | 12.4 | 24 | 20 | 8 | 67.0 | 0.2 |
| One (Fitbit) | 492.2 | 487.6–496.8 | 1.9 | 4 | 2 | 0 | 15.4 | 0.0 |
| Health (Apple) | 485.3 | 470.2–500.4 | 2.9 | 20 | 7 | 1 | 50.3 | 0.1 |
| Health Mate (Withings) | 492.4 | 474.5–510.2 | 1.5 | 21 | 9 | 1 | 59.5 | 0.1 |
| Moves (ProtoGeo Oy) | 437.6 | 395.1–480.1 | 12.5 | 29 | 20 | 7 | 141.5 | 0.3 |