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Cross-diagnostic validity of the Nottingham Health Profile Index of Distress (NHPD)
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- Wann-Hansson, Christine (author)
- Lund University,Lunds universitet,Malmö högskola,Fakulteten för hälsa och samhälle (HS),Hållbar vardag och hälsa i ett livsperspektiv,Forskargrupper vid Lunds universitet,Sustainable occupations and health in a life course perspective,Lund University Research Groups
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- Klefsgård, Rosemarie (author)
- Lund University,Lunds universitet,Institutionen för hälsovetenskaper,Medicinska fakulteten,Department of Health Sciences,Faculty of Medicine,Department of Health Sciences, Lund University, PO Box 157, SE-221 00, Lund, Sweden
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- Hagell, Peter (author)
- Lund University,Lunds universitet,Institutionen för hälsovetenskaper,Medicinska fakulteten,Department of Health Sciences,Faculty of Medicine,Department of Health Sciences, Lund University, PO Box 157, SE-221 00, Lund, Sweden; Department of Neurology, Lund University Hospital, SE-221 85, Lund, Sweden
- (creator_code:org_t)
- 2008-07-02
- 2008
- English.
- In: Health and Quality of Life Outcomes. - : BioMed Central (BMC). - 1477-7525. ; 6:2
- Journal article (peer-reviewed)
Abstract
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- BACKGROUND: The Nottingham Health Profile index of Distress (NHPD) has been proposed as a generic undimensional 24-item measure of illness-related distress that is embedded in the Nottingham Health Profile (NHP). Data indicate that the NHPD may have psychometric advantages to the 6-dimensional NHP profile scores. Detailed psychometric evaluations are, however, lacking. Furthermore, to support the validity of the generic property of outcome measures evidence that scores can be interpreted in the same manner in different diagnostic groups are needed. It is currently unknown if NHPD scores have the same meaning across patient populations. This study evaluated the measurement properties and cross-diagnostic validity of the NHPD as a survey instrument among people with Parkinson's disease (PD) and peripheral arterial disease (PAD). METHODS: Data from 215 (PD) and 258 (PAD) people were Rasch analyzed regarding model fit, reliability, differential item functioning (DIF), unidimensionality and targeting. In cases of cross-diagnostic DIF this was adjusted for and the impact of DIF on the total score and person measures was assessed. RESULTS: The NHPD was found to have good overall and individual item fit in both disorders as well as in the pooled sample, but seven items displayed signs of cross-diagnostic DIF. Following adjustment for DIF some aspects of model fit were slightly compromised, whereas others improved somewhat. DIF did not impact total NHPD scores or resulting person measures, but the unadjusted scale displayed minor signs of multidimensionality. Reliability was > 0.8 in all within- and cross-diagnostic analyses. Items tended to represent more distress (mean, 0 logits) than that experienced by the sample (mean, -1.6 logits). CONCLUSION: This study supports the within- and cross-diagnostic validity of the NHPD as a survey tool among people with PD and PAD. We encourage others to reassess available NHP data within the NHPD framework to further evaluate the strengths and weaknesses of this simple patient-reported index of illness-related distress.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Omvårdnad (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Nursing (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Hälso- och sjukvårdsorganisation, hälsopolitik och hälsoekonomi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Health Care Service and Management, Health Policy and Services and Health Economy (hsv//eng)
Keyword
- Nottingham Health Profile index of Distress
- Rasch analysis
- Parkinson disease
- Peripheral arterial disease
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- ref (subject category)
- art (subject category)
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