Table 7. Comparability of the wrist-worn activity trackers for estimating the daily physical activity recommendations during unstructured free-living conditions (n = 51). Instrument 10,000 steps P k Samsung Watch Active 2-Apple Watch Series 5 10,000 steps 0.98 0.92†  Samsung Watch Active 2-Xiaomi Mi Band 5 0.96 0.85†  Apple Watch Series 5-Xiaomi Mi Band 5 0.94 0.79†  60 min of MVPA P k Apple Watch Series 5-Xiaomi Mi Band 5 60 min of MVPA 0.45 0.04 Apple Watch Series 5-Xiaomi Mi Band 5a 0.84 0.17* Xiaomi Mi Band 5-Xiaomi Mi Band 5a 0.37 0.00 MVPA = Moderate-to-vigorous physical activity; P = Proportion of agreement; k = Kappa coefficient. a Brisk walking time (min). * p < 0.05 and †  p < 0.001.