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ROC curves for the VM counts/15 s for the waist-worn AG accelerometer for (A) non-ambulation, (B) 0.41–0.8 m/s, and (C) 0.81–1.2 m/s; ROC curves for the VM counts/15 s for the ankle-worn AG accelerometer for (D) non-ambulation, (E) 0.41–0.8 m/s, and (F) 0.81–1.2 m/s.
