Inter-instrument agreement for single days versus accumulated data.

The inter-instrument agreement for different measurement periods of accumulating the data (single-days of measurement, and data accumulated over 7-day-periods and a 21-day period). SEM (%) = standard error of the measurement (% of mean values); LoA = limits of agreement; CPM = counts per minute; VM CPM = vector magnitude counts per minute; SED = sedentary time; LPA = light physical activity; MPA = moderate physical activity; VPA = vigorous physical activity; MVPA = moderate-to-vigorous physical activity Inter-instrument agreement for single days versus accumulated data.