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Cross-diagnostic validity of the Nottingham health profile index of distress (NHPD).

Wann-Hansson, Christine LU ; Klefsgård, Rosemarie LU and Hagell, Peter LU (2008) In Health and Quality of Life Outcomes 6(July 2).
Abstract
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... (More)
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. (Less)
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Health and Quality of Life Outcomes
volume
6
issue
July 2
article number
47
publisher
BioMed Central (BMC)
external identifiers
  • wos:000258030700001
  • pmid:18597691
  • scopus:48549106550
  • pmid:18597691
ISSN
1477-7525
DOI
10.1186/1477-7525-6-47
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Caring Sciences (Closed 2012) (016514020), Division of Occupational Therapy (Closed 2012) (013025000)
id
28c89597-f72f-464d-ad3f-5120b1e5f917 (old id 1181614)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/18597691?dopt=Abstract
date added to LUP
2016-04-04 09:12:58
date last changed
2022-01-29 08:49:58
@article{28c89597-f72f-464d-ad3f-5120b1e5f917,
  abstract     = {{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.}},
  author       = {{Wann-Hansson, Christine and Klefsgård, Rosemarie and Hagell, Peter}},
  issn         = {{1477-7525}},
  language     = {{eng}},
  number       = {{July 2}},
  publisher    = {{BioMed Central (BMC)}},
  series       = {{Health and Quality of Life Outcomes}},
  title        = {{Cross-diagnostic validity of the Nottingham health profile index of distress (NHPD).}},
  url          = {{http://dx.doi.org/10.1186/1477-7525-6-47}},
  doi          = {{10.1186/1477-7525-6-47}},
  volume       = {{6}},
  year         = {{2008}},
}