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. 2017 Oct 11;3(1):e000272. doi: 10.1136/bmjsem-2017-000272

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Bland-Altman plots illustrating the relationship between the expert coder and (A) Fitbit 1 and (B) Fitbit 2. Solid line represents the mean difference between the two measures, and dashed lines represent limits of agreement (±1.96 SD).