Psychometric Validation of a Spanish-Chilean Instrument for Assessing Public Attitudes Toward Childhood Stuttering: Construct Validity and Internal Consistency.

This value was deemed sufficient given the highly significant Bartlett’s test of sphericity (χ 2 = 8717.22, df = 153, p < 0.001), which confirmed patterned relationships among items and indicated that the correlation matrix was not an identity matrix and thus appropriate for factor extraction.

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