Fig. 4

Forrest plot of the meta-analysis for the mean SCP vascular density between MS cases and healthy controls. The meta-analysis was conducted with a fixed-effects model. The size of the square for each article demonstrates the attributed weight, and the horizontal line indicates the 95% confidence interval (CI). The diamonds show the standardized mean difference, and their width represents the 95% CI. N, number of subjects; SD, standard deviation; SCP: superficial capillary plexus; MS: multiple sclerosis