Two parallel short forms to measure disease- and treatment-associated knowledge in rheumatoid arthritis: application of item response theory.

Autor:	Spijk-de Jonge MJ; Radboud University Medical Center, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen., Oude Voshaar MAH; Department of Psychology, Health and Technology, University of Twente, Enschede, The Netherlands., Renskers L; Radboud University Medical Center, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen., Huis AMP; Radboud University Medical Center, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen., van de Laar MAFJ; Department of Psychology, Health and Technology, University of Twente, Enschede, The Netherlands., Hulscher MEJL; Radboud University Medical Center, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen., van Riel PLCM; Radboud University Medical Center, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen.
Jazyk:	angličtina
Zdroj:	Rheumatology advances in practice [Rheumatol Adv Pract] 2020 Jun 17; Vol. 4 (2), pp. rkaa012. Date of Electronic Publication: 2020 Jun 17 (Print Publication: 2020).
DOI:	10.1093/rap/rkaa012
Abstrakt:	Objective: The aim was to develop two disease- and treatment-related knowledge about RA (DataK-RA) short forms using item response theory-based linear optimal test design. Methods: We used the open source Excel add-in solver to program a linear optimization algorithm to develop two short forms from the DataK-RA item bank. The algorithm was instructed to optimize precision (i.e. reliability) of the scores for both short forms, subject to a number of constraints that served to ensure that each short form would include unique items and that the short forms would have similar psychometric properties. Agreement among item response theory scores obtained from the different short forms was assessed using the Bland-Altman method and Student's paired t -test. Construct validity and relative efficiency of the short forms was evaluated by relating the score to age, sex and educational attainment. Results: Two short forms were derived from the DataK-RA item bank that satisfied all content constraints. Both short forms included 15 unique items and yielded reliable scores ( r  > 0.70), with low ceiling and floor effects. The short forms yielded statistically indistinguishable mean scores according to Student's paired t -test and Bland-Altman analysis. Scores on short forms 1 and 2 were associated with age, sex and educational attainment to a similar extent. Conclusion: In this study, we developed two DataK-RA short forms with unique items, yet similar psychometric properties, that can be used to assess patients pre- and post-test interventions aimed at improving disease-related knowledge in RA patients. (© The Author(s) 2020. Published by Oxford University Press on behalf of the British Society for Rheumatology.)
Databáze:	MEDLINE
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