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

• Published in: Asian spine journal Vol. 9; no. 6; pp. 901 - 908
• Main Authors: Nayeb Aghaei, Hossein, Azimi, Parisa, Shahzadi, Sohrab, Azhari, Shirzad, Mohammadi, Hassan Reza, Alizadeh, Pooyan, Montazeri, Ali
• Format: Journal Article
• Language: English
• Published: Korea (South) Korean Society of Spine Surgery 01-12-2015; Korean Spine Society; 대한척추외과학회
• Subjects: Central nervous system diseases; Cervical spondylotic myelopathy; Clinical Study; Confidence intervals; Copenhagen Neck Functional Disability Scale; Iran; Neck pain; Orthopedics; Pain; Patients; Quantitative psychology; Questionnaires; Spinal cord; Spinal stenosis; Standard deviation; Surgery; Validation studies; Validity; 정형외과학; Iran; Validity; Copenhagen Neck Functional Disability Scale; Iran; Cervical spondylotic myelopathy
• ISSN: 1976-1902; 1976-7846
• DOI: 10.4184/asj.2015.9.6.901

Cross-sectional.
To translate and validate the Iranian version of the Copenhagen Neck Functional Disability Scale (CNFDS).
Instruments measuring patient-reported outcomes should satisfy certain psychometric properties.
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.
Mean age of the patients was 54.3 years (standard deviation, 8.9). The Cronbach α coefficient was satisfactory (α=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).
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.