ArticleQuality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation2011
Measurement invariance of the 16-item social distress scale.
Article in Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors at 3 institutions in 1 country.
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Abstract
purposeThe SD-16 is a 16-item instrument assessing social distress in cancer patients. In addition to work underlining the scale's reliability, validity and clinical utility, recent research has also determined minimally important differences (MID) for the instrument. The aim of this study was to assess whether item locations remained stable over time, in order to support the longitudinal use of the instrument.
methodsData were collated from cancer patients (N = 123) who had completed the SD-16 at four time points (baseline, 6 months, 1 and 2 years). The Partial Credit Model (Rasch analysis) was applied to the data and item fit evaluated against published criteria. Measurement invariance of item location and person measures over time was assessed using analysis of variance.
resultsGood item fit was found with the exception of one item ("work"), which demonstrated misfit at two time points. No statistically significant differences were found for item locations. As anticipated, there were changes over time in patients' scores, particularly in the first 6 months.
conclusionsThe instrument can be used longitudinally to accurately assess changes in cancer patients' social distress.
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