The structural validity of the Finnish version of the Disabilities of the Arm, Shoulder and Hand : a Rasch model analysis
Ikonen, J., Hulkkonen, S., Ryhänen, J., Häkkinen, A., Karppinen, J., & Repo, J. P. (2020). The structural validity of the Finnish version of the Disabilities of the Arm, Shoulder and Hand : a Rasch model analysis. Hand Therapy, 25(1), 3-10. https://doi.org/10.1177/1758998320907116
Julkaistu sarjassa
Hand TherapyPäivämäärä
2020Tekijänoikeudet
© 2020 SAGE
Introduction
The construct validity of the Disabilities of the Arm, Shoulder and Hand questionnaire (DASH) has previously been questioned. The purpose of this study was to evaluate the measurement properties of the Finnish version of the DASH for assessing disability in patients with hand complaints using Rasch Measurement Theory.
Methods
A cohort of 193 patients with typical hand and wrist complaints were recruited at a surgery outpatient clinic. The DASH scores were analysed using the Rasch model for differential item functioning, unidimensionality, fit statistics, item residual correlation, coverage/targeting and reliability.
Results
In the original DASH questionnaire, the item response thresholds were disordered for 2 of 30 of the items. The item fit was poor for 9 of 30 of the items. Unidimensionality was not supported. There was substantial residual correlation between 87 pairs of items. Item reduction (chi square 95, degrees of freedom 50, p < 0.001) and constructing two testlets led to unidimensionality (chi square 0.64, degrees of freedom 4, p = 0.96). Person separation index was 0.95. The testlets had good fit with no differential item functioning towards age or gender.
Conclusion
Unidimensionality of the original Finnish version of the DASH was not supported, meaning the questionnaire seems to gauge traits other than disability alone. Hence, the clinician must be careful when trying to measure change in patients’ scores. Item reduction or the creation of testlets did not lead to good alternatives for the original Finnish DASH. Differential item functioning showed that the original Finnish scale exhibits minor response bias by age in one item. The original Finnish DASH covers different levels of ability well among typical hand surgery patients.
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Julkaisija
Sage PublicationsISSN Hae Julkaisufoorumista
1758-9983Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/34909677
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