Table 4.

ROC analysis for different ambulatory categories for 15 s and 1 min epochs.

	15 s
		Waist				Ankle
Axis	Cat.	Sen.	Spec.	AUC	Cut-Point	Sen.	Spec.	AUC	Cut-Point
V	Non-amb.	0.80	0.87	0.92	≤41	0.96	0.99	0.99	≤184
	0.41–0.8	0.70	0.57	0.60	42–372	0.75	0.83	0.79	185–1363
	0.81–1.2	0.58	0.74	0.66	373–502	0.79	0.91	0.91	1364–2851
VM
	Non-amb.	0.95	0.93	0.97	≤140	0.96	0.99	0.99	≤401
	0.41–0.8	0.76	0.59	0.61	141–572	0.82	0.88	0.83	402–1862
	0.81–1.2	0.71	0.81	0.81	573–990	0.83	0.86	0.92	1863–3265
	1 min
		Waist				Ankle
Axis	Cat.	Sen.	Spec.	AUC	Cut-Point	Sen.	Spec.	AUC	Cut-Point
V	Non-amb.	0.77	0.92	0.91	≤270	0.92	0.99	0.98	≤570
	0.41–0.8	0.65	0.65	0.60	271–1458	0.76	0.76	0.76	571–4445
	0.81–1.2	0.53	0.79	0.63	1459–2055	0.73	0.89	0.84	4446–10,793
VM
	Non-amb.	0.92	0.91	0.95	≤491	0.96	0.92	0.98	≤779
	0.41–0.8	0.72	0.66	0.61	492–2254	0.75	0.89	0.80	780–7200
	0.81–1.2	0.64	0.90	0.76	2255–4058	0.80	0.86	0.84	7201–12,487

Abbreviations: V (vertical counts), VM (vector magnitude counts), Cat (category), Sen (sensitivity), Spec (specificity), and Non-amb (non-ambulation). Speed categories are given in m/s.