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KMID : 0357220090210030001
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Journal of Korean Society Physical Therapy
2009 Volume.21 No. 3 p.1 ~ p.8
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Rasch Analysis to Neck disability Index with Neck Pain Subjects
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Kim Tae-Ho
Kim Joong-Hwi
Gong Won-Tae
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Abstract
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Purpose: The purpose of this study was to examine the functional category, the item structure and the model-data fit of the neck disability index (NDI) of neck pain subjects by performing a Rasch rating scale analysis.
Methods: The data was obtained from the assessments of 71 college students (males: 27, females: 44) with neck pain. The data of the NDI was applied to the Rasch’s rating scale model to estimate the difficulty of items, the goodness-of-fit of each item, the separation reliability and index, and the rating scale.
Results: The ’sleep’ item showed misfit and nine items were founds to be fits for self-reporting of disability due to neck pain. The most difficult item of the remaining 9 items was ’work’ and the easiest item was ’headache’. The transformation formula score=(logit score+7.10)/(7.10+0.11)100. The 6 response levels of the NDI were validated according to the structure of the rating scale. The item and subject reliability of the separation reliability was 0.97 and 0.85, respectively.
Conclusion: We proved that the NDI for self-reporting of disability of daily activities due to mild neck pain was valid and reliable. This study suggests that individuals with mild neck pain may be assessed by using the modified NDI that does not include the ’sleep’ item in the 10 items of NDI.
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KEYWORD
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Neck disability index, Neck pain, Rasch analysis
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