Receiver operating characteristics curve (ROC) analysis in One-vs-One scheme, comparing pairwise combination of adjacent behavioural classes as described in Fig 2a.

Cut-off values, sensitivity, specificity and accuracy (AUC) are reported from ‘vigorous’ to ‘motionless alert’. ‘Sedentary crafts’ and ‘Recumbent listening’ were merged into ‘Sedentary (active)’. ‘Sedentary screen time is categorised as ‘Motionless alert’. (DOCX)