Statistical analysis
Day totals of each assessment day and overall day averages were computed for physical activity measures: (sum / number of valid days). Sedentary time was corrected for accelerometer nonwear time; (total wear time–(moderate + low activity time)). In addition, time proportions in each physical activity were computed: (time in activity / total wear time)100%. Within-subject variation in physical activity was calculated as relative ratio ((minimal / maximal)100%) and within-subject variation in life-space area as absolute difference (greatest–smallest life-space area reached). Spearman correlation coefficients of the within-subject variation in physical activity and life-space area were computed.