Figure 4. . Distribution of preseason baseline time scores for the King-Devick test.

Dots represent point estimates of each study mean (or ES); sizes of the gray boxes reflect the weights of the studies in the meta-analysis. Bars are 95% CI. The diamond shows the weighted estimate for the mean preseason K-D baseline score; this is determined from fixed-effects models account for study N and precision (narrowness of 95% CI). I² statistic values were 0.0%; p = 0.85; indicating very little heterogeneity between studies in calculation of the weighted estimate. Stated differently, the nonsignificance of the I² test for heterogeneity suggests that the differences between the studies are explicable by random variation rather than systematic factors.

ES: Effect size; K-D: King-Devick.

Data taken from [29,30,47,48,49,50,51,52,53,54,55,56,72,73,74].