KMID : 1189320180120040691
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Asian Spine Journal 2018 Volume.12 No. 4 p.691 ~ p.696
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Correlation between Short-Form 36 Scores and Neck Disability Index in Patients Undergoing Anterior Cervical Discectomy and Fusion
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Ko Sang-Bong
Choi Won-Kee Chae Seung-Bum Kwon Jae-Bum Lee Young-Sik
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Abstract
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Study Design: Case control study.
Purpose: To determine how the Neck Disability Index (NDI), a cervical spine-specific outcome, reflects health-related quality-of-life, and if NDI is correlated to the 36-item Short-Form Health Survey (SF-36) scores.
Overview of Literature: NDI is a useful tool for assessing health-related quality of life in patients with neck pain.
Methods: We used the Pearson product-moment correlation coefficient to assess the validity of all items under NDI and SF-36, and the Pearson¡¯s correlation coefficient to assess the correlation between NDI and total SF-36 scores. The primary outcome measures were spine-specific health status- and general health status-measures after spine surgery, and these were evaluated every year for 2 years, using both NDI and SF-36 scores.
Results: NDI had a strong linear correlation with SF-36 and its two scales, the Physical Component Score (PCS) and the Mental Component Score (MCS), attesting to the validity of these two instruments. Among the eight subscales of SF-36, there was a strong linear correlation between NDI and PCS-physical functioning, PCS-bodily pain, and MCS-role emotional. Further, a moderate linear correlation was observed between NDI and subscales of PCS-role physical, PCS-general health, and MCS-social functioning, and between NDI and MCS-vitality and MCS-mental health.
Conclusions: Our findings suggest that the NDI adequately reflects the patient¡¯s physical and mental quality of life, implying that the use of NDI to assess functional outcomes can also be ultimately used to evaluate the patient¡¯s quality of life.
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KEYWORD
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Cervical vertebrae, Outcome assessment, Neck Disability Index, Short Form-36
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