View larger version (19K):
[in this window]
[in a new window]
|
FIGURE 1. Forest plot of studies of sugar-sweetened beverage (SB) consumption and BMI (in kg/m2) in children and adolescents. I–V, fixed-effects estimate (inverse variance method); D+L, random-effects estimate (Der Simonian and Laird method). The points for each study indicate the reported estimate for the predicted change ( ) in BMI per serving SB consumption. The size of the gray boxes indicates the weight the study received in the calculation of the overall association and CI. The weight given each study is based on the precision of the estimate. The horizontal lines indicate the 95% CI for each study. The 2 diamonds represent the overall estimate of the predicted BMI per serving SB consumption, based on the pooled results from all studies. The upper open diamond represents the fixed-effects estimation that assumes that the "true" treatment effects in all of the studies are the same. The lower open diamond represents the random-effects estimation that assumes that the true treatment effect may vary across studies. The study by Mrdjenovic and Levitsky (21) was omitted from this forest plot because it had a much larger CI than any other study. The omission of that study does not affect either the fixed-effects or random-effects estimates. ES, effect size.
|
