Factor Analysis of the Scale of Prodromal Symptoms: Differentiating between Negative and Depression Symptoms

@article{Klaassen2011FactorAO,
  title={Factor Analysis of the Scale of Prodromal Symptoms: Differentiating between Negative and Depression Symptoms},
  author={Rianne M. C. Klaassen and Eva Velthorst and Dorien H. Nieman and Lieuwe de Haan and Hiske E. Becker and Peter M.A.J. Dingemans and J Reinaud van de Fliert and Mark van der Gaag and Don H. Linszen},
  journal={Psychopathology},
  year={2011},
  volume={44},
  pages={379 - 385}
}
Background: This study examines the ability of the Scale of Prodromal Symptoms (SOPS) to differentiate between negative and depression symptoms in a young help-seeking ultrahigh risk (UHR) group. Methods: SOPS data of 77 help-seeking patients at UHR for psychosis were analyzed with an exploratory factor analysis. The extracted Depression factor was validated with the Beck Depression Inventory (BDI). The extracted SOPS Negative symptoms factor was validated with the Negative symptoms subscale of… 
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