Is There Publication Bias?

The researchers looked at a funnel plot to see if there was publication bias. The more powerful the study, the less variable it was in terms of how far they stray from the average effect size. As the studies get less powerful, that's when the effect size increases. There is also an inverse relationship between power and effect size. And those were the ones that were all on the right side of the line so that there was a significant publication bias as well.