Table 1.

Descriptive Statistics for Physical Activity and Sedentary Variables Among Older Women 2-3 Years

	Baseline N=209		Time 2 N=172		Time 3 N=166
Variable	Median	IQR	Median	IQR	Median	IQR	p-value
Days from baseline	-	-	392	(332, 432)	838	(767, 1,004)	-
Days of wear	7	(7, 7)	7	(7, 7)	7	(7, 7)	-
Wear time, min	904.4	(861.6, 946)	877.6	(829.0, 922.0)	886.0	(825.3, 940.0)	<0.01
VM countsa	483,187	(358,112, 581,932)	466,044	(362,703, 570,682)	441,423	(350,357, 580,432)	<0.01
Stepsa	5,423	(3,901, 7,038)	5,168	(3,678, 6,897)	4,921	(3,775, 6,613)	<0.01
Sedentary time, minb	509.3	(455.1, 579.7)	494.6	(444.4, 557.7)	516.3	(437.9, 574.1)	0.09
Light activity time, minc	351.9	(296.6, 412.4)	351.9	(288.6, 404.5)	342.4	(287.4, 401.7)	0.60
MVPA time, mind	21.2	(8.9, 46.3)	22.1	(7.6, 40.2)	18.8	(7.6, 37.4)	0.03
Bouted-MVPA time, mind	4.5	(0, 22.3)	4.0	(0, 19.5)	3.0	(0, 17.1)	0.03

Notes: Boldface indicates statistical significance (p<0.05. p-values are from repeated measures linear mixed models that adjust for age and wear-time to test the differences in each metric over time. Values are daily averages based on the number of days of wear.

^aSummation of vector magnitude counts per minute and step count over the daily wear period.

^bSedentary time is defined as the daily sum of minutes during which the accelerometer registers VM cpm <200¹⁹

^cLight-intensity physical activity min is defined the daily sum of minutes during which the accelerometer registers VM cpm between 200 and 2,690.²⁰

^dMVPA time is defined the daily sum of minutes during which the accelerometer registers VM cpm >=2,691,²⁰ MVPA-bouted uses same cpm threshold for activity accumulated in 10 consecutive minutes allowing 2-min below the threshold.

IQR, interquartile range; VM, vector magnitude; MVPA, moderate to vigorous physical activity; cpm, counts per minute