Table 5. Comparability of the Xiaomi Mi Band wristbands for estimating daily physical activity (n = 62).
| Instrument |
Equivalence test (90% CI) |
LOA (95% CI) |
MAE |
MAPE |
ICC (95% CI) |
| Steps (n) |
-1,060.0, 1060.0 |
|
|
|
|
| Xiaomi Mi Band 2-3 |
4.1, 182.0 |
93.0 (-728.6, 914.6) |
295.0 |
0.0 |
0.99 (0.99, 1.00) |
| Xiaomi Mi Band 2-4 |
-319.4, -194.5 |
-257.0 (-834.0, 320.0) |
293.4 |
0.0 |
1.00 (0.97, 1.00) |
| Xiaomi Mi Band 2-5 |
-212.2, -97.5 |
-154.9 (-684.7, 374.9) |
231.5 |
0.0 |
1.00 (0.99, 1.00) |
| Xiaomi Mi Band 3-4 |
-449.0, -251.1 |
-350.0 (-1264.5, 564.5) |
404.3 |
0.1 |
0.99 (0.96, 1.00) |
| Xiaomi Mi Band 3-5 |
-335.7, -160.1 |
-247.9 (-1058.9, 563.1) |
345.0 |
0.1 |
0.99 (0.98, 1.00) |
| Xiaomi Mi Band 4-5 |
36.1, 168.1 |
102.1 (-507.7, 711.9) |
246.7 |
0.0 |
1.00 (0.99, 1.00) |
| Slow pace walking (min) |
-25.4, 25.4 |
|
|
|
|
| Xiaomi Mi Band 2-3 |
-4.4, 3.4 |
-0.5 (-36.8, 35.8) |
14.0 |
0.5a |
0.82 (0.72, 0.89) |
| Xiaomi Mi Band 2-4 |
-8.9, -1.2 |
-5.0 (-40.7, 30.7) |
14.9 |
0.5 |
0.81 (0.70, 0.88) |
| Xiaomi Mi Band 2-5 |
-7.4, 1.3 |
-3.0 (-43.0, 37.0) |
15.8 |
0.5 |
0.77 (0.65, 0.85) |
| Xiaomi Mi Band 3-4 |
-8.6, -0.5 |
-4.5 (-42.1, 33.1) |
14.4 |
0.5 |
0.80 (0.69, 0.88) |
| Xiaomi Mi Band 3-5 |
-6.7, 1.7 |
-2.5 (-41.3, 36.3) |
13.7 |
0.4 |
0.79 (0.68, 0.87) |
| Xiaomi Mi Band 4-5 |
-2.1, 6.1 |
2.0 (-36.0, 40.0) |
14.1 |
0.4a |
0.80 (0.69, 0.87) |
| Brisk pace walking (min) |
-6.8, 6.8 |
|
|
|
|
| Xiaomi Mi Band 2-3 |
-0.2, 4.7 |
2.2 (-20.3, 24.7) |
5.7 |
0.3b |
0.93 (0.88, 0.96) |
| Xiaomi Mi Band 2-4 |
-2.0, 1.5 |
-0.3 (-16.8, 16.2) |
4.5 |
0.2b |
0.96 (0.94, 0.98) |
| Xiaomi Mi Band 2-5 |
-3.4, 0.6 |
-1.4 (-19.4, 16.6) |
4.8 |
0.3b |
0.95 (0.92, 0.97) |
| Xiaomi Mi Band 3-4 |
-5.2, 0.3 |
-2.5 (-27.8, 22.8) |
7.2 |
0.3c |
0.91 (0.86, 0.95) |
| Xiaomi Mi Band 3-5 |
-6.4, -0.8 |
-3.6 (-29.7, 22.5) |
7.5 |
0.3c |
0.90 (0.84, 0.94) |
| Xiaomi Mi Band 4-5 |
-3.5, 1.2 |
-1.1 (-22.5, 20.3) |
6.5 |
0.3b |
0.94 (0.90, 0.96) |
| Slow-brisk pace walking (min) |
-32.1, 32.1 |
|
|
|
|
| Xiaomi Mi Band 2-3 |
-1.9, 5.3 |
1.7 (-31.8, 35.2) |
12.5 |
0.2 |
0.93 (0.89, 0.96) |
| Xiaomi Mi Band 2-4 |
-9.0, -1.6 |
-5.3 (-39.8, 29.2) |
14.3 |
0.3 |
0.92 (0.87, 0.95) |
| Xiaomi Mi Band 2-5 |
-8.7, -0.2 |
-4.4 (-43.6, 34.8) |
15.7 |
0.3 |
0.91 (0.85, 0.94) |
| Xiaomi Mi Band 3-4 |
-11.1, -3.0 |
-7.0 (-44.4, 30.4) |
14.5 |
0.3 |
0.91 (0.83, 0.94) |
| Xiaomi Mi Band 3-5 |
-9.9, -2.4 |
-6.1 (-41.0, 28.8) |
13.7 |
0.2 |
0.92 (0.86, 0.95) |
| Xiaomi Mi Band 4-5 |
-3.2, 5.0 |
0.9 (-37.1, 38.9) |
14.4 |
0.2 |
0.92 (0.87, 0.95) |
| Moderate-to-vigorous physical activity (min) |
-6.8, 6.8 |
|
|
|
|
| Xiaomi Mi Band 2-3 |
-22.7, -4.6 |
-13.6 (-97.3, 70.1) |
34.4 |
0.6 |
0.46 (0.23, 0.63) |
| Xiaomi Mi Band 2-4 |
5.2, 18.1 |
11.6 (-48.0, 71.2) |
25.0 |
0.6 |
0.52 (0.30, 0.68) |
| Xiaomi Mi Band 2-5 |
-27.6, -10.8 |
-19.2 (-97.0, 58.6) |
32.4 |
0.5 |
0.31 (0.07, 0.52) |
| Xiaomi Mi Band 3-4 |
16.4, 34.1 |
25.2 (-56.5, 106.9) |
36.0 |
0.8 |
0.37 (0.09, 0.58) |
| Xiaomi Mi Band 3-5 |
-14.6, 3.4 |
-5.6 (-88.5, 77.3) |
31.8 |
0.5 |
0.49 (0.27, 0.65) |
| Xiaomi Mi Band 4-5 |
-38.8, -22.9 |
-30.8 (-104.1, 42.5) |
35.9 |
0.7a |
0.22 (0.00, 0.46) |
| Total physical activity (min) |
-32.1, 32.1 |
|
|
|
|
| Xiaomi Mi Band 2-3 |
-0.4, 2.0 |
0.8 (-10.4, 12.0) |
4.0 |
0.1 |
0.99 (0.98, 0.99) |
| Xiaomi Mi Band 2-4 |
-3.7, -2.0 |
-2.9 (-10.7, 4.9) |
3.6 |
0.0 |
0.99 (0.97, 1.00) |
| Xiaomi Mi Band 2-5 |
-2.0, -0.1 |
-1.1 (-9.9, 7.7) |
3.4 |
0.0 |
0.99 (0.99, 1.00) |
| Xiaomi Mi Band 3-4 |
-5.0, -2.4 |
-3.7 (-15.9, 8.5) |
5.1 |
0.1 |
0.99 (0.96, 0.99) |
| Xiaomi Mi Band 3-5 |
-3.0, -0.7 |
-1.9 (-12.5, 8.7) |
4.3 |
0.1 |
0.99 (0.98, 1.00) |
| Xiaomi Mi Band 4-5 |
0.8, 2.7 |
1.8 (-7.0, 10.6) |
3.8 |
0.0 |
0.99 (0.99, 1.00) |
SD = Standard deviation; LOA = Limits of agreement; 90%/95% CI = 90%/95% confident interval; MAE = Mean absolute error; MAPE = Mean absolute percentage error; ICC = Intraclass correlation coefficient. Due to zero values in the denominator in some cases, the sample size was as follow: a61, b54, c53.
