“…In most studies, participants were requested to wear the accelerometer for 7 d ( n = 40) (14,15,18,20,24–37,39–41,44–55,58–63,66) while they were awake ( n = 25) (15,18,20,24,25,28,29,31–34,36,37,41,44–46,49,55,59,60,66,67). Most researchers defined a week of measurement as “valid” if the accelerometer was worn for at least 4 d ( n = 25) (14,20,24–26,28,30,31,35–37,39,41,42,46,48,53,54,57,58,60,62,63,65,66) and for at least 10 h each day ( n = 41) (14,19,20,23–26,28–41,43–46,48–51,53,56,58–60,62–67). Most researchers also defined periods with 60 min of no signal or continuous zeros as “nonwear time,” but “interruptions” of up to 2 min in these periods of nonwear time were usually tolerated ( n = 13) (14,24,26,30,35,36,39,49,50,58,62,63,65).…”