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Table 3 Summary table of results showing relation between sedentary behaviour and measures of body composition

From: Systematic review of sedentary behaviour and health indicators in school-aged children and youth

Type of Study Number of Studies Number of participants Narrative recommendation and main findings
RCT 8 1886 Reductions in sedentary behaviour are directly related to improved body composition.
Intervention 10 3547 TV watching and overweight/obesity were related in a dose-response manner (i.e. those who watched more TV were more likely to be overweight/obese).
Longitudinal 33 85753 TV watching and overweight/obesity were related in a dose-response manner (i.e. those who watched more TV were more likely to be overweight/obese).
Cross sectional 119 691759 > 2 hrs of sedentary behaviour related to increased risk of being overweight or obese.
Total of all studies 170 782884 Meta-analysis was performed on randomized controlled studies that looked at change in BMI. They found an effect of -0.89 kg/m2 (95% CI of -1.67 to -0.11, p = 0.03) decrease in mean BMI in the intervention group.
> 2 hrs of sedentary behaviour per day is associated with an increased risk for overweight/obesity. This risk increases in a dose-response manner.
Each additional hour of TV viewing increased risk for obesity. > 2 hrs/day significantly increased risk for overweight/obesity.
Mean Downs and Black score = 20.9 (± 1.9), Level 2 evidence.