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Physical activity monitors that provide users with direct feedback (e.g., pedometers, smart watches) might help increase physical activity levels among adults, but studies often have been limited to specific patient populations and have provided inconsistent results. Investigators conducted a meta-analysis of 121 randomized, controlled trials (with 16,000 adults) in which physical activity monitors of any kind that provide feedback were compared with any intervention that did not provide feedback. Most of the studies were done in high-income countries; median duration of the interventions was 12 weeks.
At baseline, median daily step count was ≈7000. After the interventions, mean differences in activity translated to 1235 more daily steps and…