Table 3.

Hip-worn accelerometer cutpoints for the vertical axis (N = 200); WHI OPACH Calibration Study, 2013.

	Sedentary				Light low	Light high				MVPA
	Se	Sp	AUC	Count/15 s	Count/15 s	Se	Sp	AUC	Count/15 s	Se	Sp	AUC	Count/15 s
Criteria: maximizing the sum of sensitivity plus specificity
Normal filter
–Intensity based on activity types	91.4	61.5	0.73	0–0	0–1	76.4	88.1	0.80	1–107	95.1	93.5	0.96	≥ 108
–Intensity based on measured METS
Where 1 MET = 3.5 mL/kg/min	84.7	69.0	0.74	0–0	1–30	83.9	85.5	0.86	31–82	94.0	86.0	0.87	≥ 83
Where 1 MET = 3 mL/kg/min	88.2	61.5	0.72	0–0	0–1	84.1	77.0	0.79	1–81	90.0	90.0	0.90	≥ 82
Low frequency extension filter
–Intensity based on activity types	78.8	81.4	0.79	0–0	1–5	85.0	82.1	0.85	6–149	95.4	93.7	0.97	≥ 150
–Intensity based on measured METS
Where 1 MET = 3.5 mL/kg/min	78.1	76.6	0.77	0–5	6–48	85.0	84.1	0.87	49–138	90.7	87.8	0.89	≥ 139
Where 1 MET = 3.0 mL/kg/min	73.3	80.3	0.76	0–0	1–16	82.4	78.2	0.82	17–120	87.6	90.3	0.91	≥ 121
Criteria: balancing the number of false positives and false negatives
Normal filter
–Intensity based on activity types	91.4	61.5	0.73	0–0	0–0	76.4	88.1	0.80	0–193	84.5	97.3	0.96	≥ 194
–Intensity based on measured METS
Where 1 MET = 3.5 mL/kg/min	84.7	69.0	0.74	0–0	1–81	74.4	92.8	0.74	82–330	59.9	95.5	0.87	≥ 331
Where 1 MET = 3.0 mL/kg/min	88.2	61.5	0.72	0–0	1–17	74.4	86.1	0.79	18–190	76.0	95.7	0.90	≥ 191
Low frequency extension filter
–Intensity based on activity types	78.8	81.4	0.79	0–0	1–7	82.8	84.3	0.85	8–239	85.2	97.4	0.97	≥ 240
–Intensity based on measured METS
Where 1 MET = 3.5 mL/kg/min	76.8	77.9	0.77	0–4	5–11	73.5	92.3	0.87	112–363	58.8	95.3	0.89	≥ 364
Where 1 MET = 3.0 mL/kg/min	73.3	80.3	0.76	0–0	1–39	73.0	86.3	0.82	40–230	76.0	95.6	0.91	≥ 231

AUC: area under the curve; MET: metabolic equivalent; mL/kg/min: milliliters of oxygen per kilogram per minute; MVPA: moderate to vigorous physical activity; Se: sensitivity; Sp: specificity.