Table 1
Definitions of parent-reported and directly measured moderate-to-vigorous physical activity (MVPA), sedentary behaviour and sleep

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Table 1
Definitions of parent-reported and directly measured moderate-to-vigorous physical activity (MVPA), sedentary behaviour and sleep
 Table summary
 This table displays the results of definitions of parent-reported and directly measured moderate-to-vigorous physical activity (MVPA). This information is grouped by parent-reported (questions asked to parent, derived variable), directly measured (derived variable from accelerometry data) (appearing as column headers).
  Parent-reported Directly measured
Questions asked to parent Derived variable Derived variable from accelerometry data
MVPA About how many hours a week does he/she usually take part in physical activity that makes him/her out of breath or warmer than usual:
. . . in his/her free time at school (for example, lunch)?
. . . in his/her class time at school?
. . . outside of school while participating in lessons or league or team sports?
. . . outside of school while participating in unorganized activities, either on his/her own or with friends?		 Physical activity participation (hours per week) = sum of four questions at left; converted into average minutes per day. MVPA was derived from the accelerometry data using a cut-point of 1,500 cpm.Note 25 All minutes above this cut-point were summed across each valid day and then averaged for each child on valid days.
Sedentary behaviour/ Screen time On average, about how many hours a day does your child:
. . . watch TV or videos or play video games?
. . . spend on a computer (working, playing games, e-mailing, chatting, surfing the internet, etc.)?		 Total screen time (hours per day) = sum of two questions at left Sedentary time was defined as time spent below 100 cpm (including zero counts) accumulated during wear-time.Note 29 All wear-time minutes below this cut-point were summed across each valid day and averaged for each child on valid days.
Sleep How many hours does your child usually spend sleeping in a 24-hour period, excluding time spent resting? Sleep duration (hours per day) Proxy estimates of sleep duration were derived from the accelerometry data as the longest period of nonwear-time in a 24-hour period between two valid days and averaged for each child.