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Measurement properties of Norwegian version of the Neck Disability Index in chronic neck pain.
MedLine Citation:
PMID:  23202354     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
ABSTRACT:: Study design: Cross-sectional study.Objective: Neck pain is common in adults and often follows a chronic course accompanied by considerable functional reduction. Longstanding neck pain is often associated with problems engaging in work, emotional distress and fear of movement. These issues add to the pain-associated disability. The Neck Disability Index (NDI) is the most commonly used instrument to evaluate neck-associated pain. Our aim was to test the unidimensionality and scaling of the Norwegian version of NDI across gender, age, work status, education, pain intensity, pain distribution, and different levels of emotional distress in patients referred to specialised care.Summary of Background Data: 249 patients with neck pain with an age ≥ 16 years-old were included. All patients were referred to the Neck and Back Outpatient Clinic at Oslo University Hospital. Demographic factors, pain intensity and distribution, emotional distress, and fear of movement were recorded.Methods: A Rasch analysis was used to evaluate the unidimensionality, scaling and invariance of NDI across gender, age, education and work status.Results: The data did not fit the Rasch model (X = 63.18, p<0.0003). Three items (lifting, reading, driving) had disordered response thresholds. The pain, headache and sleep items also did not fit the Rasch model. Differential item function was detected for work status. Unidimensionality and interval scaling was obtained for a seven-item version (NDI-7) by converting the ordinal score to Rasch-weighted interval scores. The NDI matched the distribution of the patients' disability, with a slightly higher disability level reflected by the NDI compared to the patients.Conclusion: The Rasch analysis lends support to the unidimensionality of the seven items of the NDI, to its usefulness in capturing the neck patients' disability and it being generally robust to external factors.
Authors:
Jan Børre Johansen; Nada Andelic; Eva Bakke; Erik Bautz Holter; Anne Marit Mengshoel; Cecilie Røe
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-29
Journal Detail:
Title:  Spine     Volume:  -     ISSN:  1528-1159     ISO Abbreviation:  Spine     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-12-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7610646     Medline TA:  Spine (Phila Pa 1976)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
aDepartment of Physical Medicine and Rehabilitation, Oslo University Hospital, Ulleval, Norway bFaculty of Medicine, University of Oslo, Norway cDepartment of Health Sciences, Institute of Health and Society, University of Oslo, Norway.
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