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Sex Differences in the Variability of Physical Activity Measurements Across Multiple Timescales Recorded by a Wearable Device: Observational Retrospective Cohort Study

Sex Differences in the Variability of Physical Activity Measurements Across Multiple Timescales Recorded by a Wearable Device: Observational Retrospective Cohort Study

The PV quantifies variability by calculating the average percentage difference between all combinations of measurements [37-40]: where n is the total number of values, z is a list of values on which pair-wise comparisons are calculated, and i and j are indices of any 2 different values. The PV improves upon CV because it is not mean dependent, and it is less sensitive to rare events [37] (Figure 2 B).

Kristin J Varner, Lauryn Keeler Bruce, Severine Soltani, Wendy Hartogensis, Stephan Dilchert, Frederick M Hecht, Anoushka Chowdhary, Leena Pandya, Subhasis Dasgupta, Ilkay Altintas, Amarnath Gupta, Ashley E Mason, Benjamin L Smarr

J Med Internet Res 2025;27:e66231