Appendix Table 3.

Intraclass Correlation (ICC) Values for Different Subsets Based on Missing Data

Variables	All time pointsa	Subset with no missing datab	Subset with baseline and Time 2 data	Subset with baseline and Time 3 data
N	209	129	172	166
VM countsc	0.82 (0.77, 0.85)	0.84 (0.79, 0.88)	0.83 (0.78, 0.88)	0.85 (0.80, 0.89)
Stepsc	0.78 (0.73, 0.83)	0.81 (0.75, 0.85)	0.85 (0.80, 0.89)	0.79 (0.73, 0.85)
Sedentary time, mind	0.75 (0.69, 0.80)	0.74 (0.67, 0.80)	0.73 (0.66, 0.80)	0.75 (0.67, 0.82)
Light activity time, mine	0.70 (0.64, 0.76)	0.69 (0.61, 0.76)	0.68 (0.60, 0.76)	0.70 (0.61, 0.78)
MVPA time, minb	0.70 (0.64, 0.76)	0.73 (0.66, 0.79)	0.74 (0.67, 0.81)	0.70 (0.61, 0.78)
Bouted-MVPA time, minf	0.67 (0.60, 0.73)	0.73 (0.66, 0.79)	0.78 (0.71, 0.83)	0.72 (0.63, 0.79)

Notes: ICCs are adjusted for age, BMI, monitor wear time, and season when the data were collected. Values are daily averages based on the number of days of wear.

^aHave data at baseline and either Time 2, Time 3, or both.

^bHave complete data at baseline, Time 2, and Time 3

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

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

^eLight-intensity physical activity min is defined the daily sum of minutes during which the accelerometer registers VM cpm between 200 and 2,690²⁰

^fMVPA 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.

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