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Fitbit-derived step count and time in PA, but not amount of time in MVPA, exhibited exceptional contract with research actions during scripted tasks. During free-living activity, step count and time in PA correlated averagely to strongly with reference measures, but arrangement varied across metrics, data aggregation levels, and condition severity strata. Time in MVPA weakly agreed with guide measures. Nevertheless, Fitbit-derived metrics were often as distinctive from research measure