The internal consistency, test-retest reliability and factor structure of the Castilian Spanish version of the 12-item General Health Questionnaire (GHQ) were studied with a sample of 1930 Spanish adolescents (M age = 15.9 yr., SD = 2.1). Cronbach α for the whole sample was .85 (.81 for boys, .87 for girls). Test-retest reliability was also satisfactory: r = .75 for boys, .81 for girls, .79 for the whole sample. After applying principal components factor analysis with varimax rotation, two factors were identified that jointly accounted for 46.8% of the total variance, Anxiety and Social Dysfunction. The results suggest that the GHQ-12 items is a questionnaire with some satisfactory psychometric properties.
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