Table 5. Comparability of the wrist-worn activity trackers for estimating daily physical activity during unstructured free-living conditions (n = 51).
| Instrument |
LOA (95% CI) |
MAE |
MAPE |
ICC (95% CI) |
| Steps (n) |
| Samsung Galaxy Watch Active 2-Apple Watch Series 5 |
-1025.8 (-3445.2, 1393.6) |
1242.8 |
23.3 |
0.86 (0.51, 0.94) |
| Samsung Galaxy Watch Active 2-Xiaomi Mi Band 5 |
-397.8 (-1525.2, 729.6) |
518.2 |
8.4 |
0.98 (0.91, 0.99) |
| Apple Watch Series 5-Xiaomi Mi Band 5 |
628.0 (-1895.7, 3151.7) |
1103.0 |
19.4 |
0.89 (0.78, 0.94) |
| Moderate-to-vigorous physical activity (min) |
| Apple Watch Series 5-Xiaomi Mi Band 5 |
-29.4 (-114.7, 55.9) |
40.3 |
86.0 |
0.10 (0.00, 0.31) |
| Apple Watch Series 5- Xiaomi Mi Band 5a |
15.0 (-12.8, 42.8) |
16.6 |
72.1 |
0.52 (0.00, 0.78) |
| Xiaomi Mi Band 5-Xiaomi Mi Band 5a |
44.5 (-48.2, 137.2) |
50.7 |
114.1 |
0.00 (0.00, 0.12) |
| Total physical activity (min) |
| Samsung Galaxy Watch Active 2-Xiaomi Mi Band 5 |
-12.8 (-32.8, 7.2) |
14.4 |
22.9 |
0.90 (0.26, 0.97) |
| Samsung Galaxy Watch Active 2- Xiaomi Mi Band 5b |
5.6 (-21.8, 33.0) |
11.5 |
20.9 |
0.92 (0.85, 0.96) |
| Xiaomi Mi Band 5-Xiaomi Mi Band 5b |
18.4 (-9.4, 46.2) |
20.5 |
33.9 |
0.82 (0.07, 0.94) |
SD = Standard deviation; LOA = Limits of agreement; 95% CI = 95% confident interval; MAE = Mean absolute error; MAPE = Mean absolute percentage error; ICC = Intraclass correlation coefficient;
a Brisk walking time (min);
b Slow-brisk walking time (min).
