Fig. 3
Forest plots for the change of Verbal Fluency (animals) from baseline to 1, 2, and 3 years. Mean changes and 95% confidence intervals for each study and for the overall effect in the fixed effects and the random effects model are given. τ2 is the between-study variance, I2 measures heterogeneity (between study variance over total variance), p value for the test of heterogeneity. Graphs show study specific means and confidence intervals for each study as gray squares and lines and for overall effects as diamonds. Size of squares represents precision of individual treatment estimates