Create a forest plot for the data in Bloch’s study. Bloch et al. (2009) conducted a meta-analysis on the treatment of Attention-deficit/hyperactivity disorder. There have been reports that psychostimulant medications given to children with ADHD who have a history of Tourette’s syndrome can increase the severity of tics. The authors found (among other studies) four studies that compared methylphenidate derivatives against placebo-controlled condition by rating scales for tic and ADHD severity. The results of these four studies for presence and frequency of tics are shown here. (The standard errors of d were estimated from the published results.)

Study n d Cl Sd Gadow92 0.11 -0.55 -0.77 0.336 Castellanos 20 TSSG Gadow07 27 0.29 -0.18 -0.76 0.240 103 0.64 0.27 -1.00 0.184 71 0.06 -0.17 -0.29 0.117