|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.