What is the most likely effect of biases on the results of a meta-analysis?
A) The results will be statistically nonsignificant.
B) The results will be highly statistically significant.
C) The results will underestimate the effectiveness of an intervention.
D) The results will overestimate the effectiveness of an intervention.

Question

Quizplus · Accepted Answer

Biases can lead to overestimation of treatment effects in meta-analysis, as studies with larger treatment effects are more likely to be published and included in the analysis, while studies with smaller or no effects may not be reported or excluded from the analysis. This can lead to a distortion of the overall effect size estimate.

What Is the Most Likely Effect of Biases on the Results