Identifying accelerometer nonwear and wear time in older adults

Table 3 Comparison of automated algorithms ^a in estimating daily time spent being sedentary and physically active at various intensities

	60-min	90-min	120-min	150-min	180-min
Sedentary time (min/day)^b; Mean ± SD	618 ± 81	649 ± 88	667 ± 97	675 ± 98	679 ± 101
Sedentary time (% of total wear time)	75 ± 10	77 ± 10	77 ± 10	77 ± 10	77 ± 10
Light Intensity PA (min/day)^b; Mean ± SD	190 ± 76	187 ± 77	186 ± 77	185 ± 76	185 ± 77
MVPA (min/day)^b; Mean ± SD	14 ± 19	14 ± 19	14 ± 19	14 ± 19	14 ± 19
MVPA Time (% of total wear time)	1.7 ± 2.1	1.6 ± 2.1	1.6 ± 2.0	1.6 ± 2.0	1.6 ± 2.0

Abbreviations: min minute, SD standard deviation, PA physical activity, MVPA moderate to vigorous intensity physical activity.
^aThe algorithms define nonwear periods as continuous non-movement (i.e., 0 cpm) of the specified duration.
^bAccelerometer cut-points for inactive time = 0-100 cpm, light intensity PA = 101-1064 cpm and MVPA =1065 cpm or higher.

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