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

Wann-Hansson, Christine; Klevsgård, Rosemarie; Hagell, Peter

doi:10.1186/1477-7525-6-47

Cited by 23 publications

(20 citation statements)

References 37 publications

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“…This will, for example, allow for rigorous testing of whether it is possible to derive linear measures based on raw total scores. Importantly, Rasch analysis will enable firmer determination of the scale's generic properties by testing whether items work the same way in various respondent groups [33].…”

Section: Discussionmentioning

confidence: 99%

Psychometric performance of a generic walking scale (Walk-12G) in multiple sclerosis and Parkinson’s disease

et al. 2011

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Walking difficulties are common in neurological and other disorders, as well as among the elderly. There is a need for reliable and valid instruments for measuring walking difficulties in everyday life since existing gait tests are clinician rated and focus on situation specific capacity. The Walk-12G was adapted from the 12-item multiple sclerosis walking scale as a generic patient-reported rating scale for walking difficulties in everyday life. The aim of this study is to examine the psychometric properties of the Walk-12G in people with multiple sclerosis (MS) and Parkinson's disease (PD). The Walk-12G was translated into Swedish and evaluated qualitatively among 25 people with and without various neurological and other conditions. Postal survey (MS, n = 199; PD, n = 189) and clinical (PD, n = 36) data were used to test its psychometric properties. Respondents considered the Walk-12G relevant and easy to use. Mean completion time was 3.5 min. Data completeness was good (<5% missing item responses) and tests of scaling assumptions supported summing item scores to a total score (corrected item-total correlations >0.6). Coefficient alpha and test-retest reliabilities were >0.9, and standard errors of measurement were 2.3-2.8. Construct validity was supported by correlations in accordance with a priori expectations. Results are similar to those with previous Walk-12G versions, indicating that scale adaptation was successful. Data suggest that the Walk-12G meets rating scale criteria for clinical trials, making it a valuable complement to available gait tests. Further studies involving other samples and application of modern psychometric methods are warranted to examine the scale in more detail.

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Section: Discussionmentioning

confidence: 99%

Psychometric performance of a generic walking scale (Walk-12G) in multiple sclerosis and Parkinson’s disease

et al. 2011

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“…The anchoring approach requires that the common linking items be free of DIF, [21][22][23] which was not the case in our dataset. Therefore, the co-calibration approach, also applied in previous rehabilitation studies, [24][25][26][27] was followed and the analysis process is illustrated in figure 1. The first step in the data analysis was to co-calibrate the ABILHAND data of all diagnostic groups by analysing all responses (n=732) to the 83 items.…”

Section: Analysis Processmentioning

confidence: 99%

Can manual ability be measured with a generic ABILHAND scale? A cross-sectional study conducted on six diagnostic groups

et al. 2012

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ObjectivesSeveral ABILHAND Rasch-built manual ability scales were previously developed for chronic stroke (CS), cerebral palsy (CP), rheumatoid arthritis (RA), systemic sclerosis (SSc) and neuromuscular disorders (NMD). The present study aimed to explore the applicability of a generic manual ability scale unbiased by diagnosis and to study the nature of manual ability across diagnoses.DesignCross-sectional study.SettingOutpatient clinic homes (CS, CP, RA), specialised centres (CP), reference centres (CP, NMD) and university hospitals (SSc).Participants762 patients from six diagnostic groups: 103 CS adults, 113 CP children, 112 RA adults, 156 SSc adults, 124 NMD children and 124 NMD adults.Primary and secondary outcome measuresManual ability as measured by the ABILHAND disease-specific questionnaires, diagnosis and nature (ie, uni-manual or bi-manual involvement and proximal or distal joints involvement) of the ABILHAND manual activities.ResultsThe difficulties of most manual activities were diagnosis dependent. A principal component analysis highlighted that 57% of the variance in the item difficulty between diagnoses was explained by the symmetric or asymmetric nature of the disorders. A generic scale was constructed, from a metric point of view, with 11 items sharing a common difficulty among diagnoses and 41 items displaying a category-specific location (asymmetric: CS, CP; and symmetric: RA, SSc, NMD). This generic scale showed that CP and NMD children had significantly less manual ability than RA patients, who had significantly less manual ability than CS, SSc and NMD adults. However, the generic scale was less discriminative and responsive to small deficits than disease-specific instruments.ConclusionsOur finding that most of the manual item difficulties were disease-dependent emphasises the danger of using generic scales without prior investigation of item invariance across diagnostic groups. Nevertheless, a generic manual ability scale could be developed by adjusting and accounting for activities perceived differently in various disorders.

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“…The clinical significance of any observed DIF was studied by assessing how DIF influenced the estimated person locations (logit measures). Items without DIF in the original scale were first anchored by their item locations from the DIF-adjusted scale to assure that the two sets of person estimates were on the same metric (19). The two sets of person locations were then compared and correlated to assess the influence of DIF on people's estimated fatigue levels.…”

Section: Data Completeness and Rasch Model Fitmentioning

confidence: 99%

Fatigue in Parkinson's Disease: Measurement Properties of a Generic and a Condition-Specific Rating Scale

Nilsson

Bladh

Hagell

2013

Journal of Pain and Symptom Management

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PostprintThis is the accepted version of a paper published in Journal of Pain Symptom and Management. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. Citation for the original published paper (version of record):Nilsson, M., Bladh, S., Hagell, P. [Year unknown!] Fatigue in Parkinson' s disease: measurement properties of a generic and a condition-specific scale. Methods: Postal survey data (n=150; 47% women; mean age, 70) were Rasch analyzed. Journal of Pain Symptom and ManagementPFS-16 scores were tested according both to the original polytomous and the suggested alternative dichotomized scoring methods. Results:The PFS-16 showed overall Rasch model fit whereas the FACIT-F showed signs of misfit, which probably was due to a sleepiness-related item and mixing of positively/negatively worded items. There was no differential item functioning by disease duration but by fatigue status (greater likelihood of needing to sleep or rest during the day among people classified as non-fatigued) in the PFS-16 and FACIT-F. However, this did not impact total score based estimated person measures. Targeting and reliability (≥0.86) was good, but the dichotomized PFS-16 showed compromised measurement precision.Polytomous and dichotomized PFS-16 and FACIT-F scores identified 6, 3 and 4 statistically distinct sample strata, respectively. Conclusion:We found general support for the measurement properties of both scales.However, polytomous PFS-16 scores exhibited advantages compared to dichotomous PFS-16and FACIT-F scores. Dichotomization of item responses compromises measurement precision and ability to separate people, and should be avoided.3

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

Cited by 23 publications

References 37 publications

Psychometric performance of a generic walking scale (Walk-12G) in multiple sclerosis and Parkinson’s disease

Psychometric performance of a generic walking scale (Walk-12G) in multiple sclerosis and Parkinson’s disease

Can manual ability be measured with a generic ABILHAND scale? A cross-sectional study conducted on six diagnostic groups

Fatigue in Parkinson's Disease: Measurement Properties of a Generic and a Condition-Specific Rating Scale

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