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Are important patient-rated outcomes in community mental health care explained by only one factor?

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Hansson L, Björkman T, Priebe S. Are important patient-rated outcomes in community mental health care explained by only one factor? Introduction: 

The study tested whether four commonly used patient-rated outcomes are explained by only one factor, reflecting a general appraisal tendency of patients. Method: 

Quality of life, needs and symptoms were rated by 92 patients in community mental health care at baseline and after 18 months and 6 years follow-up periods. At follow ups treatment satisfaction was also assessed. Scores and change scores were subjected to factor analyses. We then tested which individual items predicted factor scores. Results: 

One factor explained between 55% and 66% of the variance of the tested patient-rated outcomes cross-sectionally and longitudinally. Only change scores of treatment satisfaction loaded on a separate factor. Seven items consistently explained more than 80% of the variance of the general factor. Conclusion: 

Four important patient-rated outcomes are uniformly and substantially influenced by a general tendency for positive or negative appraisals. This tendency can be assessed more simply than using currently established methods.

Keywords: community mental health care; evaluation; long-term outcome; patient-rated outcomes

Document Type: Research Article


Affiliations: 1: Department of Health Sciences, Lund University, Lund, Sweden 2: Unit for Social and Community Psychiatry, Queen Mary, University of London, London, UK

Publication date: August 1, 2007

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