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KMID : 1189320150090060901
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Asian Spine Journal
2015 Volume.9 No. 6 p.901 ~ p.908
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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
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Aghaei Hossein Nayeb
Azimi Parisa
Shahzadi Sohrab
Azhari Shirzad
Mohammadi Hassan Reza
Alizadeh Pooyan
Montazeri Ali
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Abstract
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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 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).
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.
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KEYWORD
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Validity, Copenhagen Neck Functional Disability Scale, Cervical spondylotic myelopathy, Iran
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