Research on selective mutism (SM) has been limited by the absence of standardised, psychometrically sound and cross-culturally valid assessment measures. Our aim is to present the results of a study of the factor structure and the reliability and concurrent validity of the scores of the Selective Mutism Questionnaire (SMQ), translated and adapted into Spanish. The SMQ contains 17 items about children's difficulty in speaking adequately in the family, school and social environment (out-of-school and out-of-family), each of which is answered according to a Likert scale with four response alternatives on speech frequency. Method: The study involved 110 pairs of parents of children diagnosed with SM whose ages ranged from 3 to 10 years. Results: The results show that the data from the Spanish sample fit the factorial model obtained by Bergman et al., and that data on its reliability and validity are robust and confirm that it as a good instrument for assessing SM in Spanish-speaking children. Conclusions: Therefore, we can affirm that the SMQ is a good instrument to assess SM in Spanish-speaking children.
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