Wulff Raw_Data_CALIBRATION MW8 GT3X.xlsx

Thirty 3-year-old children performed six directed behavioural activities individually, each for 8-10 minutes while wearing two pairs of devices at hip and wrist position. The behaviours were aligned to movement intensities from ‘motionless’ (watching cartoons) and ‘sedentary’ (recumbent story listening, sit and handcraft) to ‘light activity’ (floor play with toys), ‘moderate activity’ (engaging in a brisk walk) and ‘vigorous activity (a sprinting game. Time-keeping was ensured by direct observation. Receiver-Operating-Curve classification was applied to determine activity thresholds and Area-Under-the-Curve as an accuracy measure of the discrimination power between physical intensity classes derived from naturally occurring behaviour.