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Fig. 3 | BMC Public Health

Fig. 3

From: Developmental disparities in sedentary time by period of the day among US youth: a cross-sectional study

Fig. 3

Sedentary Patterns for each Period of an Average Week by Developmental Stage

Note. To determine the percentage of sedentary time for each period of the day, the average sedentary time in min/hour for each period of the day and developmental stage from Tables 2 and 3 were used. First, we converted min/hour into min/day by multiplying min/hour in a particular period by the length of the period in a given day (before school: 2 h, during school: 7 h, afterschool and weekday evening: 3 h, weekend morning: 5 h, afternoon: 6 h, and evening: 4 h). Then, we multiplied the min/hour by the number of days to which each period corresponds (all weekday periods were multiplied by 5 and all weekend periods were multiplied by 2). Then, we summed these averages to calculate total weekly sedentary time (visible in bar graph below), divided the individual period of the day by the weekly sum, and multiplied by 100. For example, to determine the proportion of weekly sedentary time accounted for by weekday mornings in children, we summed weekly sedentary time to 2,818 min and divided 345 by 2,818 = .07; .07 * 100 = 7%

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