Table 4.
Mean, standard deviation, and bias between wrist-wearable activity devices and criterion measures for total energy expenditure (kcal) and step counts (n=19)a.
| Device | TEEP (kcal)b | Bias | P value | Step count | Bias | P value |
| Amazfit | 1496.6 (249.1) | –542.0 (188.2) | <.001 | 11,910.3 (1864.3) | 1766.6 (1753.8) | <.001 |
| Bong 2sc | 2037.7 (208.8) | –0.9 (164.5) | .98 | 9586.4 (1600.6) | –557.4 (1602.6) | .16 |
| Flex | 2325.6 (272.2) | 287.0 (118.7) | <.001 | 12,228.2 (1377.3) | 2084.0 (1327.0) | <.001 |
| Vivofit | 2040.5 (290.4) | 1.9 (162.2) | .96 | 12,411.7 (1396.8) | 2267.9 (1300.6) | <.001 |
| GOLiFE | 1925.0 (246.8) | –113.6 (144.9) | <.001 | 11,111.8 (2374.5) | 968.1 (2497.2) | .12 |
| B2b | 1922.8 (258.1) | –115.9 (146.7) | <.001 | 12,193.9 (1246.1) | 2050.1 (1456.7) | <.001 |
| UP3 | 1970.5 (282.4) | –68.1 (148.5) | .06 | 12,031.5 (1430.4) | 1887.7 (1464.4) | <.001 |
| Shine 2 | 2426.5 (324.4) | 387.9 (209.7) | <.001 | 11,127.2 (1590.4) | 983.4 (1820.4) | .04 |
| Loop | 2181.8 (312.1) | 143.2 (92.4) | <.001 | 12,613.0 (1785.6) | 2469.2 (1714.2) | <.001 |
| Pulse O2 | 1886.0 (261.4) | –152.6 (154.2) | <.001 | 11,107.1 (1984.9) | 963.3 (2160.9) | .08 |
| Mi Band 2c | 1979.1 (239.0) | –59.5 (128.5) | .06 | 11,986.3 (1487.9) | 1842.6 (1560.2) | <.001 |
a Criterion values: McTEE 2038.6 (299.8) kcal; AGsteps 10143.8 (1396.5).
bTEEP: predicted total energy expenditure.
cAdd rest energy expenditure.