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Table 1 Mean average physical activity (avPA in cpm) and standard deviation for single axes and the three-dimensional vector magnitude (VM= \( \sqrt{{\left(\mathrm{axis}\ 1\right)}^2+{\left(\mathrm{axis}\ 2\right)}^2+{\left(\mathrm{axis}\ 3\right)}^2} \)) according to different epoch lengths (15 vs 60 s)

From: Accelerometer-derived physical activity estimation in preschoolers – comparison of cut-point sets incorporating the vector magnitude vs the vertical axis

Average PA [cpm]

15 s

60 s

Axis 1

623 ± 152

622 ± 151

Axis 2

800 ± 162

799 ± 161

Axis 3

894 ± 176

892 ± 175

Vector magnitude

1446 ± 281

1409 ± 276

  1. Axis 1 denotes the vertical axis (up-down), axis 2 the longitudinal axis (forward-backward) and axis 3 the lateral axis (left-right)