Table 2.

Description of the current and new algorithms for nonwear time intervals detection

		Current algorithm	New algorithm
Nonwear/wear Algorithm Description		1-min time intervals with consecutive zero counts for at least 60-min time window, allowing up to 2 consecutive intervals with non-zero counts less than or equal to 100 counts; any encounter of counts above 100 is considered as wearing	1-min time intervals with consecutive zero counts for at least 90-min time window (window 1), allowing a short time intervals with nonzero counts lasting up to 2 minutes (allowance interval) if no counts are detected during both the 30-min (window 2) of upstream and downstream from that interval; any nonzero counts except the allowed short interval are considered as wearing
Algorithm components
Threshold (counts/min)		100	0
Overall window 1 (min)		60	90
Artifactual movement interval (min)		2 consecutive	2
New component in the new algorithm	Up/downstream window 2 (min)	Not included	30

^-Threshold: threshold for nonzero counts allowing in a nonwear time interval

^-Window-1: minimum length of time window for consecutive zero counts to be considered a nonwear time interval

^-Artifactual movement interval: maximum length of time interval allowed for the artifactual nonzero counts during a nonwear time interval

^-Window-2: minimum length of up/down-stream time window for consecutive zero counts required before and after the artifactual movement interval to be considered a nonwear time interval