Table 6. Validity of the wrist-worn activity trackers for estimating the daily physical activity recommendations during unstructured free-living conditions (n = 51). Instrument ActiGraph wGT3X-BT 10,000 steps 60 min of MVPA %TP P k %TP P k Samsung Galaxy Watch Active 2 10,000 steps 13.7 0.96 0.83†  60 min of MVPA - - - Apple Watch Series 5 15.7 0.94 0.77†  17.6 0.96 0.87†  Xiaomi Mi Band 5 17.6 0.96 0.85†  60.8 0.41 -0.03 Xiaomi Mi Band 5a - - - 2.0 0.84 0.17* MVPA = Moderate-to-vigorous physical activity; %TP= Percentage of total positive cases according to the recommendation; P = Proportion of agreement; k = Kappa coefficient. a Brisk walking time (min). * p < 0.05; ‡ < 0.01; and †  p < 0.001.