Table 1.

Mean scores (standard deviations) and reliability coefficients for parent-report questionnaires of children's symptoms and temperament features as well as Pearson correlations among these measures.

	M (SD)	Cronbach's α	1	2	3	4	5
1. SMQ Selective mutism	38.36 (10.07)†	0.93
2. PAS-R Social anxiety	9.51 (5.62)	0.90	0.67***
3. BIQ-SF Behavioral inhibition	41.36 (14.64)	0.94	0.71***	0.88***
4. ASQ Autistic features	52.72 (11.56)	0.89	0.43***	0.48***	0.54***
5. ASQ Interactive/communicative problems	26.61 (6.83)	0.87	0.47***	0.52***	0.60***	0.89***
6. ASQ Odd/deviant behaviors	26.11 (6.27)	0.81	0.28***	0.31***	0.33***	0.87***	0.56***

N = 172. SMQ, Selective Mutism Questionnaire; PAS-R, Preschool Anxiety Scale-Revised; BIQ-SF, Behavioral Inhibition Questionnaire-Short Form; ASQ, Autism Spectrum Questionnaire.

^†Mean and standard deviation as calculated for the original SMQ total score. For the purpose of the correlation analysis, the SMQ total score was reversed so that higher scores indicated higher levels of SM symptoms.

^***p < 0.001.