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  • Title: Psychometric analysis of common mental disorders -- Screening Questionnaire (CMD-SQ) in long-term sickness absence.
    Author: Søgaard HJ, Bech P.
    Journal: Scand J Public Health; 2009 Nov; 37(8):855-63. PubMed ID: 19717571.
    Abstract:
    AIMS: Mental disorders often go undetected in primary care, for persons awarded disability pension, and in sick-leave certificates. No validity tests of instruments for detection and measurement of mental disorders have been performed in long-term sickness absence (LSA). This is the aim of the present study for Common Mental Disorders - Screening Questionnaire (CMD-SQ). METHODS: It is validity tested in a well-defined Danish population comprising all persons on continuous sickness absence just exceeding eight weeks. CMD-SQ is composed of SCL-SOM (somatization), Whiteley-7 (illness worry and conviction), SCL-ANX4 (anxiety), SCL-DEP6 (depression), SCL-8 (emotional disorder), and CAGE (alcohol dependency). RESULTS: Of 2,414 incident persons on long-term sickness absence within one year, 1,121 participated in the study by filling in CMD-SQ and a subsample of 337 was diagnosed by a psychiatric examination including Present State Examination. Psychometric properties such as scalability and monotonicity, construct validity, and predictive validity were analyzed. Further change over time was analyzed. SCL-SOM and Whiteley-7 showed slight psychometric and screening statistics whereas a combined scale of SC-ANX4, SCL-DEP6, and SCL-8, called SCL-8AD, showed the best and excellent psychometric and screening statistics. CONCLUSIONS: SCL-8AD, a sub-scale of CMD-SQ, is a promising candidate for screening and measurement of mental disorders in long-term sickness absence.
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