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Forest plot presenting the meta-analysis based on SMDs for the effect of WISC verbal IQ. The studies listed are as follows: Said et al (18), Cetingül et al (19), Raymond-Speden et al (20), Anderson et al (21), Reinfjell et al (22), Lofstad et al (23), Aukema et al (25), Halsey et al (26), Kim et al (30) and Sherief et al (33). SMD, standardized mean difference; WISC, Wechsler Intelligence Scale for Children; IQ, intelligence quotient.
