Psychometric properties of the neck disability index

To determine if a response set bias existed, to assess the factor structure and internal consistency, and to compare Neck Disability Index (NDI) scores with visual analogue scale (VAS) scores for pain intensity. Although neck pain is a common problem, few instruments exist to assess the disability t...

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Bibliographic Details
Published inJournal of manipulative and physiological therapeutics Vol. 21; no. 2; p. 75
Main Authors Hains, F, Waalen, J, Mior, S
Format Journal Article
LanguageEnglish
Published United States 01.02.1998
Subjects
Adolescent
Adult
Aged
Cross-Sectional Studies
Female
Humans
Male
Middle Aged
Neck Pain
Pain Measurement
Psychometrics
Severity of Illness Index
Surveys and Questionnaires
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Summary:To determine if a response set bias existed, to assess the factor structure and internal consistency, and to compare Neck Disability Index (NDI) scores with visual analogue scale (VAS) scores for pain intensity. Although neck pain is a common problem, few instruments exist to assess the disability that accompanies it. The NDI is a 10 item paper-and-pencil measure of disability resulting from neck pain. A cross sectional study evaluating the psychometric properties of the NDI. Seven modified versions of the original NDI were developed to assess the presence or absence of response set bias using a one-way analysis of variance. Internal consistency was measured by a Cronbach alpha, two factor analyses (exploratory and confirmatory) were conducted to examine the structure of the NDI and stepwise regression analysis was used to examine the variables most predictive of VAS scores. Results from 237 neck pain patients show that the responses given on the eight versions of the NDI are a function of the content and not of the format in which the items are presented. The NDI has stable psychometric characteristics, evidenced by high internal consistency (alpha = .92). In both factor analyses, one factor was extracted. The NDI possesses stable psychometric properties and provides an objective means of assessing the disability of patients suffering from neck pain.
ISSN:0161-4754