| 1. |
- Garmy, Pernilla, et al.
(författare)
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Salutogent frågeformulär för ungdomar
- 2017
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Våra observationer stöder både acceptansen och de psykometriska egenskaperna för SHIS som ett kort, en-dimensionellt frågeformulär för att mäta salutogen hälsa hos ungdomar.
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| 2. |
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| 3. |
- Hagell, Peter, 1966-, et al.
(författare)
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Assessment of burden among family caregivers of people with Parkinson’s disease using the Zarit Burden Interview
- 2017
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Ingår i: Journal of Pain and Symptom Management. - 0885-3924 .- 1873-6513. ; 53:2, s. 272-278
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Tidskriftsartikel (refereegranskat)abstract
- Context: Previous studies have supported the psychometric properties of the 22-item Zarit Burden Interview (ZBI-22) scale among family caregivers of people with various disorders, including Parkinson´s disease (PD). However, its short-forms have not been psychometrically tested among PD family caregivers, and available psychometric analyses have not accounted for the ordinal nature of item-level data.Objectives: To assess the psychometric properties of the ZBI-22 and its short forms among family caregivers of people with PD, while taking account for the ordinal nature of data.Methods: Cross-sectional postal survey ZBI-22 data from 66 family caregiver members (59% women; mean age, 69.6 years) of a local Swedish PD society branch were analysed according to classical test theory methods based on polychoric/polyserial correlations. Results: Missing item responses were ≤5%. Corrected item-total correlations were ≥0.42 and floor-/ceiling effects were <20%, besides for the briefest (4- and 1-item) short-forms (20% and 40% floor effects, respectively). Reliability was good for all scales (ordinal alpha, 0.89-0.95). External construct validity was in general accordance with a priori expectations. Short-forms demonstrated good criterion-related validity (rs 0.87-0.99) and discriminative ability (AUC, 0.91-0.98) relative to the full ZBI-22.Conclusion: This study provides support for the reliability and validity of the ZBI-22 and its various short forms for use among PD family caregivers. In studies where caregiver burden is a central outcome, either ZBI-22 or -12 is suggested for use; other short-forms can be used when caregiver burden is of less central focus or for clinical screening.
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| 4. |
- Hagell, Peter, 1966-, et al.
(författare)
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Manual for translation and cultural adaptation of the Minimal Eating Observation and Nutrition Form – Version II (MEONF-II)
- 2015
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This report describes the procedure for translation and culturaladaptation of the Minimal Eating Observation and Nutrition Form –Version II (MEONF-II) from Swedish or U.K. English for use in otherlanguages and countries, including adaptations from Swedish andU.K. English to other Swedish (e.g., Finland) and English speakingregions (e.g., United States, Canada, Australia), respectively. Theprescribed methodology is based on the dual-panel approach forpatient-reported rating scales, but modified for clinical assessmenttools used by health care professionals. The approach emphasises theimportance of achieving conceptual rather than linguistic equivalence,as well as ease and immediacy of the translation. The procedurecomprises three main steps: (1) A panel of 3-7 bilingual health careprofessionals work together to produce a first draft target languageversion; (2) Review the first draft target language version by a secondpanel of 3-7 monolingual nurses and/or final year student nursesnative in the target language; (3) Clinical field-testing of the newtarget language version by 15-30 hospital ward nurses/final yearstudent nurses using the MEONF-II with at least five patients each toevaluate its user-friendliness and appropriateness. Following a writtenreport including all major discussions and difficulties experienced bythe panels and during field-testing, there is a need for evidence of theequivalence of the translated MEONF-II relative to the originalversion, before it can be recommended for general implementationinto clinical practice. This final step is not covered in any detail here,but only outlined in summary. The procedures described here providean easy to follow step-by-step practically oriented manual to facilitatethe production of high quality translations and adaptations of theMEONF-II into new linguistic and cultural settings. This will ease theprocess for nurses and others who are interested in implementing theMEONF-II as a means of improving nutritional care for hospitalinpatients.
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| 5. |
- Hagell, Peter, 1966-, et al.
(författare)
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Sample size and statistical conclusions from tests of fit to the Rasch measurement model according to the RUMM2030 program
- 2015
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Konferensbidrag (refereegranskat)abstract
- Sample size is a major contributor to statistical null hypothesis testing, which is the basis for many approaches to testing Rasch model fit. To allow for taking this into account, the RUMM2030 Rasch analysis software has the ability to adjust n in the calculation of its chi-2 based fit statistics. This paper examines the effects of such post-hoc adjustments on the statistical conclusions, and explores the occurrence of type I errors with Rasch model fit statistics implemented in RUMM2030. Data simulations of Rasch model fitting 25-item dichotomous scales with sample sizes ranging from n=50-2500 were generated an analysed regarding fit with and without adjusted sample sizes corresponding to the same n values as those simulated. Results suggest that post-hoc downward sample size adjustment is a useful procedure to avoid type I errors when working with relatively large data sets (n≥500). The value of upward adjustment with small data sets is less clear, particularly regarding the total item-trait chi-2 test, which tends to falsely signal misfit. Under the assumption of Rasch model fit, our observations suggest that a sample size around 250 (up to about 500) provides a good balance for the statistical interpretation of RUMM2030 fit statistics.
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| 6. |
- Hagell, Peter, 1966-, et al.
(författare)
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Sample size and statistical conclusions from tests of fit to the Rasch model according to the Rasch Unidimensional Measurement Model (RUMM) program in health outcome measurement
- 2016
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Ingår i: Journal of Applied Measurement. - 1529-7713. ; 17:4, s. 416-431
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Tidskriftsartikel (refereegranskat)abstract
- Sample size is a major factor in statistical null hypothesis testing, which is the basis for many approaches to testing Rasch model fit. Few sample size recommendations for testing fit to the Rasch model concern the Rasch Unidimensional Measurement Models (RUMM) software, which features chi-square and ANOVA/F-ratio based fit statistics, including Bonferroni and algebraic sample size adjustments. This paper explores the occurrence of Type I errors with RUMM fit statistics, and the effects of algebraic sample size adjustments. Data with simulated Rasch model fitting 25-item dichotomous scales and sample sizes ranging from N=50 to N=2500 were analysed with and without algebraically adjusted sample sizes. Results suggest the occurrence of Type I errors with N≥500, and that Bonferroni correction as well as downward algebraic sample size adjustment are useful to avoid such errors, whereas upward adjustment of smaller samples falsely signal misfit. Our observations suggest that sample sizes around N=250 to N=500 may provide a good balance for the statistical interpretation of RUMM fit statistics studied here with respect to Type I errors and under the assumption of Rasch model fit within the examined framed of reference (i.e., about 25 item parameters well targeted to the sample).
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| 7. |
- Hagell, Peter, 1966-, et al.
(författare)
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The Swedish SCOPA-SLEEP for assessment of sleep disorders in Parkinson's disease and healthy controls
- 2016
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Ingår i: Quality of Life Research. - 0962-9343 .- 1573-2649. ; 25:10, s. 2571-2577
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: SCOPA-SLEEP is a rating scale for night-time sleep and daytime sleepiness (DS) proposed for use among people with Parkinson's disease (PD) as well as others. We translated it into Swedish and assessed its psychometric properties in PD and age-matched healthy controls.METHODS: Following translation according to the dual-panel approach, the Swedish SCOPA-SLEEP was field-tested regarding comprehensibility, relevance and respondent burden (n = 20). It was then psychometrically tested according to classical test theory (data completeness, scaling assumptions, targeting, reliability and construct validity) using data from 149 people with PD and 53 age-matched healthy controls from the prospective Swedish BioFINDER study.RESULTS: SCOPA-SLEEP took a mean of 3.5 min to complete and was considered easy to use and relevant. Missing item responses were <8 %, corrected item-total correlations were ≥0.47 (except for one DS item among controls), factor analyses suggested one dimension per scale, floor/ceiling effects were ≤17 %, reliability was ≥0.85 except for the DS scale among controls (0.65) and construct validity was supported.CONCLUSIONS: Observations concur with previous evaluations, thus providing initial support for the Swedish SCOPA-SLEEP among people with PD. Further studies are needed to establish its generic properties and to understand its measurement properties in better detail.
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| 8. |
- Hagell, Peter, 1966-
(författare)
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Towards end-user centered outcome measurement : an example from Parkinson’s disease
- 2014
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Konferensbidrag (refereegranskat)abstract
- Clinical trial rating scale based outcome measures have been criticized of lacking relevance and meaning to end-users, particularly patients. This is concerning since inferences regarding the usefulness of therapies are based on rating scale derived numbers. In order to be meaningful and in accord with their purpose in clinical trials, rating scale based outcome measures should not only be rigorous measures of the variables they intend to quantify, but they also need to represent variables that are important to end-users such as patients and health care professionals. This requires an understanding of what to measure, and state-of-the-art psychometric methods to ensure that rating scale derived data represent meaningful quantitative measures. However, relatively little is known about what variables that people with, e.g. Parkinson’s disease (PD) prioritize for outcome measurement and how this compares to the views of health care professionals. These issues will be discussed and illustrated in view of recent mixed-methods (Group Concept Mapping) studies in PD. Results illustrate similarities in patients’ and health care professionals’ views in that both considered quality of life as the most important outcome variable and both ranked walking/mobility and sleeping problems among the top five outcome variables. This may serve as guidance in designing future clinical trials. However, data also illustrate important differences in conceptual perspectives. Considerations such as those revealed in these studies should be taken into account in order to render clinical trial outcomes more meaningful and interpretable from an end-user perspective.
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| 9. |
- Heaney, Alice, et al.
(författare)
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Evaluation of the unidimensional fatigue impact scale (U-FIS) in Crohn's disease : the importance of local item dependency
- 2021
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Ingår i: Journal of Nursing Measurement. - 1061-3749 .- 1945-7049.
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND AND PURPOSE: The Unidimensional Fatigue Impact Scale (U-FIS) was developed for use in a multiple sclerosis population. The aim was to determine whether the U-FIS is a valid tool for measuring the impact of fatigue in Crohn's disease (CD).METHOD: CD patients completed the U-FIS as part of a validation study of the Crohn's Life Impact Questionnaire (CLIQ). Data were analyzed according to Rasch measurement theory (RMT).RESULTS: Two hundred sixty-one completed U-FIS questionnaires were available for analysis. After rescoring the items to resolve disordered thresholds, all 22 items showed acceptable RMT fit. However, there was considerable local item dependency (LID).CONCLUSION: The U-FIS did not provide unidimensional measurement in a sample of CD patients due to high levels of LID. Combining the three FIS outcomes into a single measure was not justified.
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| 10. |
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