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Real-word examples of evolution of physical activity (PA) level within the first 30-day period of the use of a wearable activity tracker. (a) Mean PA level=3223 steps per day; PA level coefficient of variation (CV)=98%. (b) Mean PA level=2720 steps per day; PA level CV=34%. (c) Mean PA level=8822 steps per day; PA level CV=78%. (d) Mean PA level=11,073 steps per day; PA level CV=12%.
