Rasch validation of the Danish version of the shoulder pain and disability index (SPADI) in patients with rotator cuff-related disorders.
Karl Bang ChristensenKristian ThorborgPer HölmichMikkel Bek ClausenPublished in: Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation (2018)
The measurement properties of the Danish SPADI are similar to those of the English version. SPADI should be reported as two separate subscales. For the pain subscale, DIF with respect to age was disclosed, but the impact was small. The eight-item disability subscale did not fit the Rasch model. A six-item version of the disability subscale exhibited adequate fit in the Danish version. The same items were also found to fit the Rasch model in the English version.