Comparison of bedtime rest classification from accelerometer placed on waist or wrist calculated using Sadeh's algorithm and the decision tree with classification obtained using whole- room indirect calorimeter.

a- Area under the ROC curve calculated as sensitivity multiplied by specificity before data was rounded; b- defined as the probability of correctly classifying bedtime rest period; c- defined as a probability of correctly classifying activity period; d- Wilcoxon signed rank test; e- automated computer algorithm; f- cut points were 20 counts/min (bedtime) and 500 counts/min (activity); g- cut points were 250 counts/min (bedtime) and 3000 counts/min (activity).