Fitbit usage
Use of the Fitbit Flex was measured at week 12 through three questions 1) ‘during the last month, how many weeks have you worn the Fitbit?’, 2) ‘on weeks where you wore the Fitbit during the last month, on average how many days per week were you wearing the Fitbit?’ and 3) ‘on days where you wore the Fitbit during the last month, on average how many hours a day were you wearing the Fitbit?’ These questions were used to determine average hours of Fitbit use per day between weeks 9 and 12. Objective data of the number of days that the Fitbit was used in the week prior was extracted from tailoring + Fitbit participants’ accounts at each 