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We examined receptive language and academic abilities in children with selective mutism (SM; n = 30; M age = 8.8 years), anxiety disorders (n = 46; M age = 9.3 years), and community controls (n = 27; M age = 7.8 years). Receptive language and academic abilities were assessed using standardized tests completed in the laboratory. We found a significant group by sex interaction for receptive vocabulary scores such that, within females, the SM and mixed anxiety groups had significantly lower receptive vocabulary scores than community controls. We also found that children with SM and children with anxiety disorders had significantly lower mathematics scores than community controls. Despite these differences in mathematics and receptive vocabulary performance, children with SM and children with anxiety disorders still performed at age-level norms, while more children in the community control group performed above age-level norms. Findings suggest that despite their speaking inhibition in the school setting, children with SM are still able to attain the receptive vocabulary and academic abilities that are expected at their age levels. Copyright © 2009 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

We examined differences among 158 children, 44 with selective mutism (SM; M = 8.2 years, SD = 3.4 years), 65 with mixed anxiety (MA; M = 8.9 years, SD = 3.2 years), and 49 community controls ( M = 7.7 years, SD = 2.6 years) on primary caregiver, teacher, and child reports of behavioral and socio-emotional functioning. Children with SM were rated lower than controls on a range of social skills, but the SM and MA groups did not significantly differ on many of the social skills and anxiety measures. However, children with SM were rated higher than children with MA and controls on social anxiety. Findings suggest that SM may be conceptualized as an anxiety disorder, with primary deficits in social functioning and social anxiety. This interpretation supports a more specific classification of SM as an anxiety disorder for future diagnostic manuals than is currently described in the literature. The present findings also have implications for clinical practice, whereby social skills training merits inclusion in intervention for children with anxiety disorders as well as children with SM. [ABSTRACT FROM AUTHOR]