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The total sample comprised 3078 patients (72% women, mean age\u2009=\u200935\u2009\u00b1\u20099) admitted to 14 different day hospitals participating in the Norwegian Network of Personality\u2010focused Treatment Programmes. Mokken Scale Analysis was used to investigate the dimensionality of the SCL\u201090\u2010R and improve the subscales. This analysis was theory\u2010driven: the scales were built on two start items that reflected the content of the disorder that corresponds with the specific scale. The Graded Response Model was employed to determine measurement precision. Our theory\u2010driven IRT approach resulted in a new seven\u2010factor solution including 60 of the 90 items clustered in seven scales: depression, agoraphobia, physical complaints, obsessive\u2010compulsive, hostility (unchanged), distrust and psychoticism. Most of the new scales discriminated reliably between patients with moderately low scores to moderately high scores. In conclusion, we found support for the multidimensionality of the SCL\u201090\u2010R in a large sample of severely disturbed patients. <jats:italic>Copyright \u00a9 2011 John Wiley &amp; Sons, Ltd.<\/jats:italic><\/jats:p>","DOI":"10.1002\/mpr.347","type":"journal-article","created":{"date-parts":[[2011,8,3]],"date-time":"2011-08-03T19:16:28Z","timestamp":1312398988000},"source":"Crossref","is-referenced-by-count":40,"title":["A study of the dimensionality and measurement precision of the SCL\u201090\u2010R using item response theory"],"prefix":"10.1002","volume":"20","author":[{"given":"Muirne C. 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