Factor structure, internal consistency and construct validity of the Sheehan Disability Scale in a Spanish primary care sample

Autor: Juan V, Luciano, Jordan, Bertsch, Luis, Salvador-Carulla, José M, Tomás, Ana, Fernández, Alejandra, Pinto-Meza, Josep M, Haro, Diego J, Palao, Antoni, Serrano-Blanco
Rok vydání: 2010
Předmět:
Zdroj: Journal of evaluation in clinical practice. 16(5)
ISSN: 1365-2753
Popis: The Sheehan Disability Scale (SDS) is a three-item instrument that measures disability in three inter-related domains: work, family life/home responsibilities and social/leisure activities. The main objective of the present study was to examine the factor structure, reliability and construct validity of the SDS in a wide Spanish sample of primary care (PC) patients.One phase cross-sectional survey. A total of 3815 patients, aged 18 years or older attending PC for a medical visit, were interviewed between October 2005 and March 2006. The interviews included the Structured Clinical Interview for DSM-IV Axis I Disorders for depressive and anxiety disorders, the Mini-International Neuropsychiatric Interview for the rest of mental disorders, a medical conditions checklist, the 2.0 version of the 12-item Short-Form Health Survey (SF-12) for measuring quality of life and the SDS.The principal component analysis and the subsequent confirmatory factor analysis indicated that the SDS is one-dimensional (normed fit index = 0.990, non-normed fit index = 0.987, comparative fit index = 0.991, goodness-of-fit index = 0.993, standardized root mean-square residual = 0.037, root mean-square error of approximation = 0.053). The internal consistency of the scale was good (α = 0.83) and it was significantly associated with the physical and mental component of the SF-12. Concerning discriminative validity, patients with major depression or panic disorder scored higher on the SDS than patients with chronic medical conditions or with no chronic pathology. We also found that a cut-off point of 8 in the SDS adequately discriminated between patients with and without depression (area under the curve = 0.814, sensitivity = 81.60%, specificity = 70.60%).The SDS seems a reliable, valid and useful clinical tool for measuring disability in Spanish PC patients.
Databáze: OpenAIRE
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