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Separating Bedtime Rest from Activity Using Waist or Wrist-Worn Accelerometers in Youth

Figure 3

Waist-worn accelerometer data for the development group showing tradeoff between sensitivity and specificity.

Each circle represents sensitivity (y-axis) and 1 – specificity (x-axis), calculated using ROC analysis for a curve (not shown) of a respective set of cut points. The solid circle [•] in the inset represents the selected optimal cut points (counts/min) for bedtime rest (CP1) and activity (CP2). The corresponding values are in Table 2 (bold). The solid square [▪] represents Sadeh's algorithm (Table 3) and the solid triangle [▴] represents the validation set (Table 4).

Figure 3