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Confirmatory factory analysis of the Neck Disability Index in a general problematic neck population indicates a one-factor model
- Source :
- The Spine Journal. 14:1410-1416
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- BACKGROUND CONTEXT: The Neck Disability Index frequently is used to measure outcomes of the neck. The statistical rigor of the Neck Disability Index has been assessed with conflicting outcomes. To date, Confirmatory Factor Analysis of the Neck Disability Index has not been reported for a suitably large population study. Because the Neck Disability Index is not a condition-specific measure of neck function, initial Confirmatory Factor Analysis should consider problematic neck patients as a homogenous group. PURPOSE: We sought to analyze the factor structure of the Neck Disability Index through Confirmatory Factor Analysis in a symptomatic, homogeneous, neck population, with respect to pooled populations and gender subgroups. STUDY DESIGN: This was a secondary analysis of pooled data. PATIENT SAMPLE: A total of 1,278 symptomatic neck patients (67.5% female, median age 41 years), 803 nonspecific and 475 with whiplash-associated disorder. OUTCOME MEASURES: The Neck Disability Index was used to measure outcomes. METHODS: We analyzed pooled baseline data from six independent studies of patients with neck problems who completed Neck Disability Index questionnaires at baseline. The Confirmatory Factor Analysis was considered in three scenarios: the full sample and separate sexes. Models were compared empirically for best fit. RESULTS: Two-factormodelshavegoodpsychometricpropertiesacrossboththepooledandsexsubgroups.However,accordingtotheseanalyses,theone-factorsolutionispreferablefrombothastatistical perspectiveandparsimony.Thetwo-factormodelwasclosetosignificantforthemalesubgroup(p!.07) where questions separated into constructs of mental function (pain, reading headaches and concentration) and physical function (personal care, lifting, work, driving, sleep, and recreation). CONCLUSIONS: The Neck Disability Index demonstrated a one-factor structure when analyzed by Confirmatory Factor Analysis in a pooled, homogenous sample of neck problem patients. However, a two-factor model did approach significance for male subjects where questions separated into constructs of mental and physical function. Further investigations in different conditions, subgroup
- Subjects :
- Adult
Male
medicine.medical_specialty
Psychometrics
617.5: Orthopädische Chirurgie
Population
Context (language use)
Severity of Illness Index
Disability Evaluation
Surveys and Questionnaires
Secondary analysis
Clinimetrics
Humans
Medicine
Disabled Persons
Orthopedics and Sports Medicine
education
Whiplash Injuries
Outcome
Measurement
education.field_of_study
Neck Pain
business.industry
Middle Aged
Confirmatory factor analysis
Homogeneous
Measure outcomes
Physical therapy
Female
Surgery
Neurology (clinical)
Factor analysis
Headaches
medicine.symptom
Factor Analysis, Statistical
business
Neck
Neck Disability Index
Subjects
Details
- ISSN :
- 15299430
- Volume :
- 14
- Database :
- OpenAIRE
- Journal :
- The Spine Journal
- Accession number :
- edsair.doi.dedup.....a4f2de7bfc9328fcff7ed65819b3548a
- Full Text :
- https://doi.org/10.1016/j.spinee.2013.08.026