Abstract
Psychometric properties of the Oviedo sleep questionnaire. To determine the psychometric properties of a new questionnaire for the evaluation of sleep disorders, the Oviedo Sleep Questionnaire (COS). Patients: a total of 1426 patients diagnosed with major depression (DSM-IV criteria) from all over Spain. Assessment: an "ad hoc" protocol which included sociodemographic and clinical variables, the Hamilton Depression Rating Scale (HDRS), and the COS were employed. Internal construct validity: 2 factors were obtained on the factor analysis which explain 47.4% of the total variance. Factor 1, insomnia, explains 33.4% and factor 2, hypersomnia, explains 14%. Pearson's correlation coefficient between the insomnia severity scale of the COS and the sleep index of the HDRS was .7811. Alpha's Cronbach was .7667. The psychometric properties obtained lead us to conclude that the COS is a valid instrument for its application in depressed patients.
