Rasch analysis of the hospital anxiety and depression scale (hads) for use in motor neurone disease
Chris Sidey‐Gibbons; Roger Mills; Everard W. Thornton; John Ealing; John D. Mitchell; Pamela J. Shaw; Kevin Talbot; Alan Tennant; Carolyn Young
BACKGROUND: The Hospital Anxiety and Depression Scale (HADS) is commonly used to assess symptoms of anxiety and depression in motor neurone disease (MND). The measure has never been specifically validated for use within this population, despite questions raised about the scale's validity. This study seeks to analyse the construct validity of the HADS in MND by fitting its data to the Rasch model. METHODS: The scale was administered to 298 patients with MND. Scale assessment included model fit, differential item functioning (DIF), unidimensionality, local dependency and category threshold analysis. RESULTS: Rasch analyses were carried out on the HADS total score as well as depression and anxiety subscales (HADS-T, D and A respectively). After removing one item from both of the seven item scales, it was possible to produce modified HADS-A and HADS-D scales which fit the Rasch model. An 11-...
Chris Sidey‐Gibbons, Roger Mills, Everard W. Thornton, John Ealing, John D. Mitchell, Pamela J. Shaw, Kevin Talbot, Alan Tennant, & Carolyn Young (2011). Rasch analysis of the hospital anxiety and depression scale (hads) for use in motor neurone disease. Health and Quality of Life Outcomes, 9(1), 82-82. https://doi.org/10.1186/1477-7525-9-82