Asian Spine J.  2015 Dec;9(6):901-908. 10.4184/asj.2015.9.6.901.

Outcome Measures of Functionality, Social Interaction, and Pain in Patients with Cervical Spondylotic Myelopathy: A Validation Study for the Iranian Version of the Copenhagen Neck Functional Disability Scale

• Nayeb Aghaei H
• Azimi P
• Shahzadi S
• Azhari S
• Mohammadi
• Alizadeh P
• Montazeri

• KMID: 2131113
• DOI: http://doi.org/10.4184/asj.2015.9.6.901

Abstract

STUDY DESIGN: Cross-sectional. PURPOSE: To translate and validate the Iranian version of the Copenhagen Neck Functional Disability Scale (CNFDS). OVERVIEW OF LITERATURE: Instruments measuring patient-reported outcomes should satisfy certain psychometric properties.
METHODS
Ninety-three cases of cervical spondylotic myelopathy were entered into the study and completed the CNFDS pre and postoperatively at the 6 month follow-up. The modified Japanese Orthopedic Association Score was also completed. The internal consistency, test-retest, convergent validity, construct validity (item scale correlation), and responsiveness to change were assessed.
RESULTS
Mean age of the patients was 54.3 years (standard deviation, 8.9). The Cronbach alpha coefficient was satisfactory (alpha=0.84). Test-retest reliability as assessed by the intraclass correlation coefficient analysis was 0.95 (95% confidence interval, 0.92-0.98). The modified Japanese Orthopedic Association score correlated strongly with the CNFDS score, lending support to its good convergent validity (r=-0.80; p<0.001). Additionally, the correlation of each item with its hypothesized domain on the CNFDS was acceptable, suggesting that the items had a substantial relationship with their own domains. These results also indicate that the instrument was responsive to change (p<0.0001).
CONCLUSIONS
The findings suggest that the Iranian version of the CNFDS is a valid measure to assess functionality, social interaction, and pain among patients with cervical spondylotic myelopathy.

Keyword

Validity; Copenhagen Neck Functional Disability Scale; Cervical spondylotic myelopathy; Iran

MeSH Terms

Asian Continental Ancestry Group
Follow-Up Studies
Humans
Interpersonal Relations*
Iran
Neck*
Orthopedics
Outcome Assessment (Health Care)*
Psychometrics
Spinal Cord Diseases*